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9.6 Precautions for Creating a Remote Link

Question

What are the precautions for creating a remote link?

Answer

l

If a Fibre Channel network is used, set

Link Type

to

FC

. If an IP network is used, set

Link Type

to

iSCSI

.

l

If two storage systems of a remote link have different versions, initiate link creation from
the storage system of the later version. Otherwise, link creation fails.

9.7 Functions of Reserved Space for an Asynchronous
Remote Replication Task

Question

How do I plan reserved space for a storage pool when creating an asynchronous remote
replication task? What are the functions of reserved space?

Answer

Reserved space stores snapshots generated during asynchronous remote replication. Storage
space is reserved because:

l

Copy-on-write (COW) for I/Os newly written to the host during remote replication
occupies the storage pool space of the primary storage array. In addition, COW for data
synchronization I/Os of the secondary storage array occupies the storage pool space of
the secondary storage array.

l

If the storage pool cannot provide sufficient space, COW for host I/Os or data
synchronization I/Os of the secondary storage array fails due to insufficient space. As a
result, the remote replication session enters the split state. You are advised to reserve
30% of LUN space in an asynchronous remote replication task for copy-on-write.

When configuring an asynchronous remote replication task, reserve certain space in the
storage pool of the secondary storage array to ensure that sufficient space is provided for
COW for host I/Os or data synchronization I/Os of the secondary storage array during remote
replication.

The following example shows how to plan reserved space:

The scheduled synchronization period of an asynchronous remote replication task is 1 hour,
the synchronization rate is medium (15 MB/s on average), and the host bandwidth is 5 MB/s.

l

Amount of data written into the host during 1 hour = 1 x 60 x 60 x 5 = 18000 MB

l

Time required for replicating data from the primary LUN to the secondary LUN =
18000/15 = 1200s

l

Amount of data written into the primary LUN when data is replicated from the primary
LUN to the secondary LUN = 1200 x 5 = 6000 MB

OceanStor V3 Series
Remote Replication Feature Guide for Block

9 FAQs

Issue 06 (2018-01-30)

Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

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Summary of Contents for OceanStor 18500 V3

Page 1: ...OceanStor V3 Series V300R006 Remote Replication Feature Guide for Block Issue 06 Date 2018 01 30 HUAWEI TECHNOLOGIES CO LTD ...

Page 2: ...cument may not be within the purchase scope or the usage scope Unless otherwise specified in the contract all statements information and recommendations in this document are provided AS IS without warranties guarantees or representations of any kind either express or implied The information in this document is subject to change without notice Every effort has been made in the preparation of this d...

Page 3: ...5800 V3 OceanStor 6000 V3 series OceanStor 6800 V3 OceanStor 18000 V3 series OceanStor 18500 V3 and 18800 V3 Intended Audience This document is intended for l Technical support engineers l Maintenance engineers Symbol Conventions The symbols that may be found in this document are defined as follows Symbol Description DANGER Indicates an imminently hazardous situation which if not avoided will resu...

Page 4: ...ulative The latest document issue contains all the changes made in earlier issues Issue 06 2018 01 30 This issue is the sixth official release The following sections are updated l Optimized descriptions about section Impact and Restrictions l Added description of the OceanStor 2600 V3 Video Surveillance Edition Issue 05 2017 11 30 This issue is the fifth official release The updates are as follows...

Page 5: ...ontrollers function l Changed Enable Disable Protection for Secondary Resource to setting Status of Secondary Resource Protection l Optimized the description about section Impact and Restrictions Issue 01 2017 02 28 This issue is the first official release OceanStor V3 Series Remote Replication Feature Guide for Block About This Document Issue 06 2018 01 30 Huawei Proprietary and Confidential Copy...

Page 6: ...mote Replication 43 3 6 1 Creating a Synchronous Remote Replication Applicable to V300R006C00 43 3 6 2 Creating a Synchronous Remote Replication Applicable to V300R006C10 45 3 6 3 Creating an Asynchronous Remote Replication Applicable to V300R006C00 50 3 6 4 Creating an Asynchronous Remote Replication Applicable to V300R006C10 56 3 7 Creating a Consistency Group 62 3 8 Verifying the Configuration ...

Page 7: ...ormation 146 8 2 Modifying Remote Device Information 149 8 3 Modifying the Advanced Properties of a Remote Link 152 8 4 Deleting a Remote Link 153 8 5 Removing a Remote Device 154 9 FAQs 156 9 1 What Are the Differences Between Synchronous Remote Replication and Asynchronous Remote Replication 157 9 2 How Do I Use the Secondary LUN in a Remote Replication Task 158 9 3 Why Information About the Pri...

Page 8: ...lication Pair Is Created 165 A Using the External Storage System to Perform Initial Synchronization for a Remote Replication 166 A 1 Introduction 166 A 2 Configuration Operation Using the LUN Copy Feature of the External Storage System 167 A 3 Configuration Operation Using the LUN Copy Feature of the Production and DR Centers 169 B How to Obtain Help 171 B 1 Preparations for Contacting Huawei 171 ...

Page 9: ...ions on the remote replication feature 1 5 Application Scenarios The remote replication feature is used for data backup and DR The typical application scenarios include central backup and DR and 3DC 1 1 Overview This section describes the background definition purposes and benefits of the remote replication feature Background As the digitalization drive advances in various industries data has beco...

Page 10: ...ry To recover service data using backup data in the remote storage system after the service data becomes unusable This feature prevents damage caused by data loss in the case that data at the primary site becomes unusable Continuous support for services To quickly switch service data from the primary site to the secondary site protecting service continuity This feature prevents damage caused by a ...

Page 11: ...anStor 5300 V3 5500 V3 5600 V3 and 5800 V3 V300R006 OceanStor 6000 V3 series OceanStor 6800 V3 V300R006 OceanStor 18000 V3 series OceanStor 18500 V3 and 18800 V3 V300R006 Table 1 3 Secondary storage systems that support remote replication Product Series Product Model Version OceanStor T series OceanStor S2600T S5500T S5600T S5800T S6800T V200R002C00SPC200 and later OceanStor 18000 series OceanStor...

Page 12: ...f the synchronization interval is longer than 15 minutes Because a host s cached data may not be completely delivered to the storage system when synchronization is triggered data synchronized to the remote end may be inconsistent with that at the local end BCManager eReplication can ensure data consistency between hosts at both ends For details about BCManager eReplication see the related User Gui...

Page 13: ...covery is implemented using synchronization The original pair is restored after another primary secondary switchover Phases in a full remote replication process Pair A pair is the relationship between a primary logical unit number LUN and a secondary LUN in a remote replication task Between pairs data can be replicated only from the primary LUN to the secondary LUN and only after a pair is establi...

Page 14: ...ted the pair running status changes to Invalid because the primary and secondary system configurations become inconsistent Synchronizing Data is being copied from the primary to the secondary LUN In this state data on the secondary LUN is unavailable and cannot be used for service recovery if a disaster occurs Only Consistent LUNs can be used to recover services Consistency Group A consistency gro...

Page 15: ...martDedupe SmartCompression and the secondary LUN is a thin LUN with no space allocated During the initial synchronization data in the primary LUN is read in sequence and the consecutive 64 KB all zero data will not be synchronized to the secondary LUN l In other scenarios except the previous two during the initial synchronization the system reads data in the primary LUN in sequence The 64 KB all ...

Page 16: ... storage system to maintain host services You must configure the secondary LUN to be writable in the following scenarios l The primary LUN fails and the remote replication link is in the disconnected state l The primary LUN fails and the remote replication link is in the normal state The pair must be split before you enable the secondary LUN to be writable Link Compression In an asynchronous remot...

Page 17: ...ary storage system The characteristics of synchronous remote replication are as follows l After receiving a write I O request from a host the primary storage system sends the request to the primary and secondary LUNs l The data write result is returned to the host only after the data is written to both primary and secondary LUNs The data write result is determined by whether the data is successful...

Page 18: ...log to the DCL upon any write failure Deletes the log if all writes are successful RM LOG Write I O result RM Remote replication management module LOG Records data write logs DCL Data change log NOTE The DCL is stored on all the disks in the disk domain and four disk RAID 1 is used for data protection while storage system logs are stored on coffer disks 1 The host sends a write I O request to the ...

Page 19: ...re as follows l Asynchronous remote replication relies on the snapshot technology A snapshot is a point in time copy of source data l When a host successfully writes data to a primary LUN the primary storage system returns a response to the host declaring the successful write l Data synchronization is triggered manually or automatically at configured intervals When an asynchronous remote replicati...

Page 20: ...ary LUN snapshot Secondary LUN Secondary LUN snapshot DCL Data block N Records the difference in the DCL Write I O result Eliminates the difference in the DCL Incremental data is synchronized to the secondary cache Primary Cache Secondary Cache Data block N The secondary LUN snapshot is created 4 1 Data block N 2 Write I O result Data block N 5 Data is replicated from the primary cache and LUN to ...

Page 21: ...L 4 When a replication period starts the snapshots of the primary and secondary LUNs are activated 5 Data is replicated from the primary cache and LUN to the secondary cache Asynchronous remote replication employs multi time point caching technology to replicate data from cache to the DR site The working principle is as follows a When a replication period starts new time segments T2 and P2 are res...

Page 22: ...rvices as quickly as possible The Recovery Time Objective RTO depends on host services and disasters in remote replication scenarios Choose the remote replication mode based on the RPO and RTO requirements of users Service Switchover Through Remote Replication Services can run on the secondary storage system only when the following conditions are met l Historical service data exists in the seconda...

Page 23: ...ry site copies data to the secondary site 1 The primary site is working properly Phases in a service switchover Primary LUN Secondary LUN Primary LUN Secondary LUN Secondary LUN Primary LUN Read only Read Write Read only NOTE After a primary secondary switchover the respective primary and secondary sites record changed data to avoid full synchronization when the secondary site becomes the primary ...

Page 24: ...hronization again to eliminate the difference caused by host writes during the previous synchronization Then split Pair to set the secondary LUN to be writable and perform a primary secondary switchover to restore the pre disaster pair After recovered the pair set the secondary resource protection status to read only in the primary storage system 3 The primary site recovers services Secondary LUN ...

Page 25: ...ication sessions must be in the same remote storage system l LUNs of different member remote replication sessions in a consistency group can belong to different working controllers l Remote replication sessions in the same consistency group must use the same remote replication mode Remote Replication Without Using a Consistency Group Data on LUNs not added to a consistency group is at risk for bec...

Page 26: ...y LUN03 No consistency group is created on the primary storage system During synchronization remote replication session 02 fails due to a fault Remote replication sessions 01 and 03 succeed As a result data in the primary storage system becomes inconsistent with that in the secondary storage system After the remote replication session failure the secondary storage system recovers data in the prima...

Page 27: ... remote replication session 02 fails due to a fault The consistency group stops remote replication sessions 01 and 03 immediately After the fault is rectified the consistency group resumes synchronization In the event of a disaster the secondary storage system recovers data on the primary storage system Data in the primary storage system is available immediately after the recovery Primary LUN01 Pr...

Page 28: ... scenarios of HyperReplication and their conditions Table 1 5 Typical application scenarios of remote replication Analysis Items Central Backup and DR 3DC Scenario characteristics l Backup data is managed centrally so that data analysis and data mining can be performed without affecting services l When a disaster occurs at a service site the central backup site can quickly take over services at th...

Page 29: ... 8 shows a central backup and DR scenario Figure 1 8 Central backup and DR Service site 01 Service site 02 Service site n Primary LUN 01 Host Central backup site Secondary LUN 01 Secondary LUN 02 Secondary LUN n Remote replication session 01 Synchronous Remote replication session 02 Remote replication session n Asynchronous Asynchronous Snapshot n Snapshot 02 Primary LUN 02 Primary LUN n Functions...

Page 30: ...d 3DC configuration in synchronous asynchronous mode Figure 1 9 Cascaded 3DC configuration in synchronous asynchronous mode Storage System LUN Production center Site A Storage System Intra city DR center Site B Storage System Site C LUN Remote DR center Asynchronous Remote Replication Optical fiber cable Network cable LUN Synchronous Remote Replication The cascaded 3DC in synchronous asynchronous ...

Page 31: ...ronous mode meets the following service requirements l Real time backup and remote backup of data achieve robust reliability of critical service data and ensure that critical service data has two copies l The cascaded 3DC has minor impact on the performance of the storage system in the production center and does not affect host services l When a disaster occurs at the production center A the intra...

Page 32: ...ical service data has two copies l Data backup of the remote DR center C does not depend on the intra city DR center B If the intra city DR center B or remote DR center C fails the production center A still has a backup site l When a disaster occurs at the production center A the intra city DR center B takes over services immediately and recovers data If the disaster also affects the intra city DR...

Page 33: ...nter A the intra city DR center B takes over services immediately and recovers data If the disaster also affects the intra city DR center B data in the remote DR center C is still available NOTE The difference between 3DC in synchronous asynchronous and asynchronous asynchronous modes lies in the different data synchronization modes of the production center A and intra city DR center B For the dat...

Page 34: ...perMetro member LUNs in the production center A or intra city DR center B and LUNs in the remote DR center implementing remote DR for data Using BCManager eReplication to Implement DR BCManager eReplication is a DR management software program specially designed for Huawei typical DR solutions It provides a visualized and process based platform for simple and fast operations and monitoring with dat...

Page 35: ...lication Agent on production hosts and DR hosts in the production center Figure 1 15 Using BCManager eReplication to deploy cascaded 3DC DR center 1 Production center Production host DR host BCManager eReplication host BCManager eReplication Agent BCManager eReplication Agent BCManager eReplication Server Synchronous Asynchronous remote replication DR center 2 DR host BCManager eReplication host B...

Page 36: ...ter 2 DR host BCManager eReplication host BCManager eReplication Agent BCManager eReplication Server Asynchronous remote replication Storage system Storage system Storage system NOTE For details about how to install deploy and configure BCManager eReplication see the BCManager eReplication production documentation OceanStor V3 Series Remote Replication Feature Guide for Block 1 Feature Description...

Page 37: ...ovides the maximum transmission distance for remote replication in each networking mode Table 2 1 Maximum transmission distance for remote replication in different networking modes Networking Mode Synchronous remote replication Asynchronous Remote Replication Direct connection using iSCSI host ports 100 m to 150 m 100 m to 150 m Direct connection using Fiber Channel host ports multi mode optical f...

Page 38: ...te success response is returned only after the data in each write request is written to the primary site and secondary site If the primary site is far away from the secondary site the write latency of applications is quite long affecting user services Therefore synchronous remote replication applies to scenarios where the primary site is near to the secondary site for example intra city disaster r...

Page 39: ...ransmission 3 3 Checking the License File Remote replication is a value added feature that requires a licence file Before configuring remote replication ensure that its license file is valid 3 4 Optional Adding Routes If iSCSI networking is adopted and data needs to be transmitted across network segments you need to configure routes 3 5 Adding a Remote Device This operation enables you to establis...

Page 40: ...ocess This section describes how to configure remote replication You can set up a pair relationship between the primary resource and secondary resource to implement data synchronization Figure 3 1 shows the process of configuring remote replication Figure 3 1 Process for configuring remote replication Start Check the remote replication license Add a remote device Create a remote replication Mandat...

Page 41: ...Ports Remote replication supports data transmission based on FC host ports or iSCSI host ports l Fibre Channel port Fibre Channel ports feature high transmission rate and low transmission latency However Fibre Channel ports use multi mode optical fibers as transmission media Multi mode optical fibers support only a short transmission distance Therefore remote replication that uses Fibre Channel po...

Page 42: ...apacity of the Storage Pool To Which LUNs Belong License Capacity You Must Apply for the Storage Pool Total License Capacity You Must Apply StoragePool001 5 GB 10 GB 5 GB 25 GB StoragePool002 10 GB 10 GB 10 GB StoragePool003 20 GB 10 GB 10 GB Procedure Step 1 Log in to DeviceManager Step 2 Choose Settings License Management Step 3 Check the active license files 1 In the navigation tree on the left...

Page 43: ...e 127 127 127 10 127 127 127 11 127 127 127 12 and 127 127 127 13 Therefore the IP address of the router cannot fall within the 127 127 127 XXX segment Besides the IP address of the gateway cannot be 127 127 127 10 127 127 127 11 127 127 127 12 or 127 127 127 13 Otherwise routing will fail Internal heartbeat links are established between controllers for these controllers to detect each other s wor...

Page 44: ...application server or the other storage device If Prefix is set for an IPv6 address this parameter specifies the prefix of the IPv6 address for the application server s service network port or that of the other storage system s Ethernet port 6 In Gateway enter the gateway of the local storage system s Ethernet port IP address Step 5 Click OK The route information is added to the route list A secur...

Page 45: ...ed link is Invalid delete and add the link again l To ensure data transfer security among storage systems you are advised to use a device such as a security gateway to encrypt links to prevent information leakage l If the version of the local device is different from that of the remote device you need to add a remote device on the newer version device Otherwise the operation may fail Step 5 Set up...

Page 46: ...er n If remote devices are OceanStor 18000 series V100R001C10 T series V200R002C10 or OceanStor V3 series V300R001C00 or earlier you need to use the super administrator or administrator account on the older version remote device Value n The default username of the machine machine user is mm_user n Obtain the super administrator or administrator account on the remote device OceanStor V3 Series Remo...

Page 47: ... advised to change your login password periodically in the future by executing the change mm_user password command This reduces the password leakage risks For details about how to use the command see the Command Reference of the corresponding product model n The password of the super administrator or administrator account is consistent with the password on the remote device TCP IP Port Ethernet po...

Page 48: ...OceanStor 18000 series V100R001C10 T series V200R002C10 or OceanStor V3 series V300R001C00 or earlier you need to use the super administrator or administrator account on the older version remote device Value n The default username of the machine machine user is mm_user n Obtain the super administrator or administrator account on the remote device OceanStor V3 Series Remote Replication Feature Guid...

Page 49: ...the command see the Command Reference of the corresponding product model n The password of the super administrator or administrator account is consistent with the password on the remote device Step 6 Click Next The information summary is displayed Step 7 Click Finish The operation result is displayed Perform the following operations based on the number of links you want to add l To add only one li...

Page 50: ... storage devices exceeds 25 km you can run the following command to enable the fast write function to ensure link transfer efficiency l FC link By default this function is disabled This function is only enabled for 4 port 8 Gbit s Fibre Channel links You can run the change port fc fc_port_id XXX fast_write_enable yes command to enable the fast write function To obtain the value of fc_port_id run s...

Page 51: ...e the same l The statuses of primary and secondary LUNs are healthy l The primary and secondary LUNs have not configured any feature that conflicts with the remote replication feature Procedure Step 1 Log in to DeviceManager Step 2 Choose Data Protection Remote Replication Step 3 Click Create The Create Remote Replication Pair dialog box is displayed Step 4 Select the replication mode of the remot...

Page 52: ...is heavy The speed is normally from 0 to 5 MB s Medium When the speed is set to medium remote replication will take a relatively short period This value is applicable to scenarios where the service load is heavy The speed is normally from 10 to 20 MB s default value High When the speed is set to high remote replication will take a short period This value is applicable to scenarios where the servic...

Page 53: ...cation pair to a newly created consistency group 1 Select Create a consistency group and add pairs to it 2 Set Name and Description of the consistency group 3 Click Next NOTE You cannot set Timeout Threshold second when creating consistency groups After the remote replication is added to a consistency group it inherits the configuration of the consistency group Step 8 Confirm the creation of the r...

Page 54: ...able LUNs of the application are displayed in Primary Resource For details about how to create storage resources based on applications see Creating Storage Resources Based on Applications in the OceanStor V3 Series V300R006 Basic Storage Service Guide for Block For OceanStor 2000 V3 series excluding 2600 V3 Video Surveillance Edition and 2800 V3 5000 V3 series and 6000 V3 series you can configure ...

Page 55: ...e a relatively short period This value is applicable to scenarios where the service load is heavy The speed is normally from 10 to 20 MB s default value High When the speed is set to high remote replication will take a short period This value is applicable to scenarios where the service load is relatively light The speed is normally from 50 to 70 MB s Highest When the speed is set to highest remot...

Page 56: ...nually synchronize the data from the primary resource to the secondary resource in the pair Automatic The pair enters the Synchronizing state The system will automatically synchronize the data from the primary resource to the secondary resource in the pair default value Default value Automatic OceanStor V3 Series Remote Replication Feature Guide for Block 3 Configuring Remote Replication Issue 06 ...

Page 57: ...nchronization is not required Ensure that the data on the primary and secondary resources is consistent If the data is inconsistent the secondary resource cannot be used to recover data or take over services from the primary resource when the primary resource fails As a result data loss and service interruption may occur Default value Data is inconsistent between the primary and secondary resource...

Page 58: ... 4 Click Close End 3 6 3 Creating an Asynchronous Remote Replication Applicable to V300R006C00 Creating an asynchronous remote replication includes the following operations configuring basic information about the remote replication selecting a primary resource and a secondary resource and setting remote replication properties You can proceed as prompted Prerequisites l The remote replication licen...

Page 59: ...orage resources created based on applications are not displayed when you create a remote replication pair because this type of storage resources is not supported by OceanStor 18000 V3 series 3 In the Secondary Resource area select a remote device to which the primary resource is copied from the Remote Device drop down list 4 In the Secondary Resource area select the secondary resource 5 Click Add ...

Page 60: ...d is set to highest remote replication will be complete in the shortest period This value is applicable to scenarios where the service load is light The speed is normally above 100 MB s Default value Medium Recovery Policy After the remote replication internal I O error is rectified or the replication link is up the remote replication pair automatically synchronizes data or not The values include ...

Page 61: ...it when synchronization begins The system starts timing as soon as the latest synchronization begins When the time specified in Interval has elapsed the system automatically starts to synchronize data between the primary resource and secondary resource again NOTE If the latest synchronization is still being executed after the time specified in Interval has elapsed the data synchronization will sta...

Page 62: ...1 to 1440 inclusive when minutes is used as the unit The interval is an integer ranging from 3 to 59 inclusive when seconds is used as the unit Default value If the unit is minute the default value is 60 minutes If the unit is second the default value is 30 seconds NOTE When the primary end model is 2200 V3 the resource type is LUN the unit can only be minutes and the interval is an integer rangin...

Page 63: ... data on the primary and secondary resources is consistent If the data is inconsistent the secondary resource cannot be used to recover data or take over services from the primary resource when the primary resource fails As a result data loss and service interruption may occur Default value Data is inconsistent between the primary and secondary resources After a remote replication task is created ...

Page 64: ...y and secondary LUN is created on the remote device l The storage capacities of primary and secondary LUNs are the same l The statuses of primary and secondary LUNs are healthy l The primary and secondary LUNs have not configured any feature that conflicts with the remote replication feature Procedure Step 1 Log in to DeviceManager Step 2 Choose Data Protection Remote Replication Remote Replicatio...

Page 65: ... is not supported by OceanStor 18000 V3 series 4 Click Next Step 5 Select synchronous remote replication primary and secondary resources 1 From the Remote device drop down list select the remote device where the secondary resource resides NOTE If no remote device exists click Add to add one 2 In the Primary Resource area select the remote replication primary resource 3 In the Secondary Resource ar...

Page 66: ...d is set to highest remote replication will be complete in the shortest period This value is applicable to scenarios where the service load is light The speed is normally above 100 MB s Default value Medium Recovery Policy After the remote replication internal I O error is rectified or the replication link is up the remote replication pair automatically synchronizes data or not The values include ...

Page 67: ...it when synchronization begins The system starts timing as soon as the latest synchronization begins When the time specified in Interval has elapsed the system automatically starts to synchronize data between the primary resource and secondary resource again NOTE If the latest synchronization is still being executed after the time specified in Interval has elapsed the data synchronization will sta...

Page 68: ...1 to 1440 inclusive when minutes is used as the unit The interval is an integer ranging from 3 to 59 inclusive when seconds is used as the unit Default value If the unit is minute the default value is 60 minutes If the unit is second the default value is 30 seconds NOTE When the primary end model is 2200 V3 the resource type is LUN the unit can only be minutes and the interval is an integer rangin...

Page 69: ...and secondary resources is consistent If the data is inconsistent the secondary resource cannot be used to recover data or take over services from the primary resource when the primary resource fails As a result data loss and service interruption may occur Default value Data is inconsistent between the primary and secondary resources After a remote replication task is created the system automatica...

Page 70: ...data copy of its primary LUN at 3 00 PM today therefore ensures the data availability of primary LUNs after disaster recovery Prerequisites l The Role of the remote replication pair to be added into the consistency group must be Primary l The remote replication pair to be added into the consistency group must be from the same storage device l The Replication Mode of the remote replication pair to ...

Page 71: ... Consistency Group Parameters Parameter Description Setting Name The name of the consistency group Value range l The name must be unique l The name can contain letters digits periods underscores _ and hyphens l The name contains 1 to 31 characters Example ConsistentGroup001 Description The description of the consistency group None OceanStor V3 Series Remote Replication Feature Guide for Block 3 Co...

Page 72: ...ritten data and the secondary resource In the data synchronization later only the different data the primary site records are synchronized to the secondary site reducing the write latency of application server to the minimum Default value Asynchronous Recovery Policy After the remote replication internal I O error is rectified or the replication link is up the consistency group automatically synch...

Page 73: ...The speed is normally from 50 to 70 MB s l Highest When the speed is set to highest remote replication will be complete in the shortest period This value is applicable to scenarios where the service load is light The speed is normally above 100 MB s Default value Medium Data Transmission During data synchronization for the consistency group data is compressed or not If you select data compression ...

Page 74: ...test synchronization is still being executed after the time specified in Interval has elapsed the data synchronization will start after the latest synchronization finishes l Timed wait after synchronization ends The system starts timing as soon as a synchronization ends When the time specified in Interval has elapsed the system starts to synchronize data again NOTE This parameter is available only...

Page 75: ...vice of Secondary Resource of Pair select the remote device NOTE The remote device is the storage device which the secondary resource of the remote replication pair to be added into the consistency group belongs to 2 From the Available Remote Replication Pairs list select one or multiple remote replication pairs and click to add Step 6 Confirm the consistency group creation 1 Click Next and view t...

Page 76: ...ded 1 Log in to the application server at the primary site and write file X txt to the primary LUN When Pair Running Status is Normal go to the next step 2 Log in to DeviceManager at the primary site Choose Data Protection Remote Replication Remote Replication Pair Click the remote replication to be synchronized Choose More Synchronize to perform the synchronization manually 3 Log in to the standb...

Page 77: ...ether an alarm about remote replication exists on DeviceManager at the primary and secondary sites If yes solve the fault based on the alarm information and repeat the previous operations If no contact technical support engineers 3 Switch services back to the primary site after the verification Log in to DeviceManager at the primary site choose Data Protection Remote Replication Remote Replication...

Page 78: ...y Group Click the consistency group to be synchronized Choose More Synchronize to perform the synchronization manually Step 3 Check whether a primary secondary switchover can be performed on the secondary site 1 Log in to DeviceManager at the secondary site choose Data Protection Remote Replication Remote Replication Consistency Group and perform the following operations a Right click the consiste...

Page 79: ... the fault based on the alarm information and repeat the previous operations If no contact technical support engineers 3 Switch services back to the primary site after the verification Log in to DeviceManager at the primary site choose Data Protection Remote Replication Remote Replication Consistency Group and perform the following operations a Click the consistency group to be split and choose Mo...

Page 80: ...is section analyzes the requirements of a carrier that implements central backup and disaster recovery using the remote replication feature and comes to a conclusion Requirement Source A carrier has a service site at site A At site A there is an application server that serves the user data management application Data generated by the application server is stored in an OceanStor storage system The ...

Page 81: ...rt P0 on controller A 172 16 19 30 255 255 0 0 172 16 0 1 Host port P0 on controller B 172 16 19 31 255 255 0 0 172 16 0 1 The carrier wants to protect service data at site A against natural disasters and quickly recover the service data when a disaster occurs The specific requirements are as follows l Data backup and disaster recovery Data at site A is automatically backed up to a backup site wit...

Page 82: ...ta at the disaster recovery site is significant for data recovery Therefore data at the disaster recovery site must be available any time Service continuity The disaster recovery site must be able to quickly take over services at the service site through a service switchover to protect service continuity Others Other factors to be considered include cost as well as central data management and anal...

Page 83: ...setting the Interval to 10 minutes to satisfy the RPO requirement l Others Besides backup and disaster recovery the carrier hopes backup data be managed centrally and latest data at service sites be available anytime so that services can be analyzed conveniently Therefore data at service sites needs to be centrally backed up to one site In this way copies of all data can be quickly obtained when n...

Page 84: ...efore setting up the connections a detailed networking plan must be drawn Table 4 5 describes the IP address plan for site B Table 4 5 IP address plan for site B Port IP Address Subnet Mask Gateway Management network port 192 168 19 10 255 255 0 0 192 168 0 1 Host port P0 on controller A 172 17 20 31 255 255 0 0 172 17 0 1 Host port P0 on controller B 172 17 20 32 255 255 0 0 172 17 0 1 Service Pl...

Page 85: ...m at site B In the storage system at site B create a secondary LUN of the same size as the primary LUN at site A Start Check the license files Create a secondary LUN Create an asynchronous remote replication session End After a logical connection is set up between the two storage systems create an asynchronous remote replication session in the storage system at site A Configure host port IP addres...

Page 86: ...ure None None None Create a secondary LUN in the storage system at site B Create a disk domain Before creating a storage pool a disk domain needs to be created All the disks used to create a storage pool are in the disk domain Disk domain s name and disk type l Name l Disk Type l DiskDomain_ BK l Performance Tier SAS OceanStor V3 Series Remote Replication Feature Guide for Block 4 Configuration Ex...

Page 87: ...he secondary storage array to ensure that sufficient space is provided for COW for host I Os or data synchronizati on I Os of the secondary storage array during remote replication Storage pool parameters and available disk domains for the storage system at site B l Name l Disk Domain l RAID policy l Capacity l StoragePool_ BK l DiskDomain_ BK l RAID 5 4D 1P l 1TB OceanStor V3 Series Remote Replica...

Page 88: ...g Storage Pool l LUN_BK l 500GB l 1 l StoragePool_ BK Set up a logical connection between sites A and B Configure host port IP addresses This step is fundamental for setting up a logical connection between the two storage systems IP addresses of host port at site A and that at site B l IPv4 Address l Subnet Mask l Site A 172 16 19 30 255 255 0 0 l Site B 172 17 20 31 255 255 0 0 OceanStor V3 Serie...

Page 89: ...0 255 255 0 0 172 16 0 1 l Site B Network segment route 172 16 0 0 255 255 0 0 172 17 0 1 Add a remote device Set up a logical connection between the primary and secondary storage systems for remote data transmission NOTE You only need to perform this step on either storage system Remote device information of the storage system at site A or site B l Link type l Controller l Port l IP address l Use...

Page 90: ...e respectively NOTE You are advised to change your login password periodically in the future by executing the change mm_user password command This reduces the password leakage risks For details on using the command see the Command Reference of the corresponding product model l If remote devices are OceanStor 18000 series V1R1C10 T series V2R2C10 or OceanStor V3 series V3R1C00 or earlier you need t...

Page 91: ...n feature On the navigation bar of DeviceManager of each storage system click Settings Click License Management On the Active License tab page check information about the license file for remote replication If the license file does not grant the permission for remote replication search for License in Help Then follow the displayed instructions to import and activate the license file Step 2 Create ...

Page 92: ...hich multiple LUNs can be created On the navigation bar of DeviceManager click Provisioning On the Storage Configuration and Optimization area click Storage Pool to create StoragePool_BK OceanStor V3 Series Remote Replication Feature Guide for Block 4 Configuration Example Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 84 ...

Page 93: ...ick Provisioning And on the Block Storage Service area click LUN to create a secondary LUN The secondary LUN must have the same capacity as the primary LUN 500 GB Otherwise the system cannot detect the created secondary LUN when you are adding a secondary LUN OceanStor V3 Series Remote Replication Feature Guide for Block 4 Configuration Example Issue 06 2018 01 30 Huawei Proprietary and Confidenti...

Page 94: ... how to configure a port IP address The procedure for any other host port on either site is the same In the navigation tree click Provisioning Click Port and click the host port whose IP address you want to change Click Properties On the Properties of the Port dialog box configure the IP address of the port OceanStor V3 Series Remote Replication Feature Guide for Block 4 Configuration Example Issu...

Page 95: ...owing uses the primary storage system at site A as an example to describe how to add a route for a host port The procedure at site B is the same After modifying host port IP address in Ethernet Ports select the host port for which you need to add routes Click Route Management and choose Add in the displayed dialog box to add route information OceanStor V3 Series Remote Replication Feature Guide fo...

Page 96: ...o describe how to add a remote device The procedure for the secondary storage system at site B is the same On the navigation bar of DeviceManager click Data Protection and then Remote Device Choose Add Remote Device to add a remote device following the Add Remote Device Wizard dialog box OceanStor V3 Series Remote Replication Feature Guide for Block 4 Configuration Example Issue 06 2018 01 30 Huaw...

Page 97: ...10 T series V2R2C10 or OceanStor V3 series V3R1C00 or earlier you need to use the password of the super administrator or administrator account on the older version remote device The username and password of the super administrator or administrator account are consistent with those on the remote device 4 Add an iSCSI link Only one link is selected between the storage systems when a remote device is...

Page 98: ...ction and then Remote Replication Choose Create to create RP_001 following the Create Remote Replication Wizard dialog box OceanStor V3 Series Remote Replication Feature Guide for Block 4 Configuration Example Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 90 ...

Page 99: ...perties of the asynchronous remote replication OceanStor V3 Series Remote Replication Feature Guide for Block 4 Configuration Example Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 91 ...

Page 100: ...t site A and that at site B are normal l Initial synchronization of the asynchronous remote replication session is complete Procedure Step 1 Map the primary and secondary LUNs to the hosts 1 Log in to DeviceManager and choose Provisioning LUN LUN Group Click Create to create LUN groups Then add primary and secondary LUNs to corresponding LUN groups OceanStor V3 Series Remote Replication Feature Gu...

Page 101: ...et the secondary LUN to readable and writable c Choose More Primary Secondary Switchover to switch the secondary LUN to the primary LUN 2 Log in to the standby server at the secondary site and write file Y txt to the new primary LUN Check whether the primary LUN is readable and writable If yes a primary secondary switchover can be performed on the secondary site If no a primary secondary switchove...

Page 102: ... cancel secondary resource protection and then Properties Modify Status of secondary resource protection to Read Write to set the secondary LUN to readable and writable c Click the remote replication pair for which you want to perform the switchover and choose More Primary Secondary Switchover d Select the remote replication task for which you want to enable secondary resource protection and then ...

Page 103: ...ication link fault or a failure in the production array Failing to perform the splitting does not affect subsequent operations 2 Set the secondary resource protection status to readable and writable on the DR storage system 3 Map the secondary LUN to the standby host NOTE Be aware that you cannot map primary and secondary LUNs to a same host otherwise volume label conflict may occur on the host ca...

Page 104: ...itchover the production center is the primary site and the DR center is the secondary site After the switchover the production center is the secondary site and the DR center is the primary site 3 Set the secondary resource protection status to read only NOTE During this operation production hosts cannot be accessed Before performing this operation ensure that services on the production hosts can b...

Page 105: ...the production center is the secondary site and the DR center is the primary site After the switchover the production center is the primary site and the DR center is the secondary site 7 Run services on the production host After the production center is recovered perform the following operations to switch the services back to the production center if asynchronous remote replication is configured 1...

Page 106: ...ng this operation production hosts cannot be accessed Before performing this operation ensure that services on the production hosts can be suspended and suspend them 4 Start synchronization NOTE This operation overwrites data in the production center using data in the DR center Before performing this operation ensure that data in the production center can be overwritten OceanStor V3 Series Remote ...

Page 107: ...host services in the DR center have been stopped 6 Manually start incremental synchronization to copy data from the DR storage system to the production storage system and ensure data consistency between the storage systems 7 Perform the splitting OceanStor V3 Series Remote Replication Feature Guide for Block 5 Disaster Recovery Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huaw...

Page 108: ...uction center is the secondary site and the DR center is the primary site After the switchover the production center is the primary site and the DR center is the secondary site 10 Set the secondary resource protection status to read only OceanStor V3 Series Remote Replication Feature Guide for Block 5 Disaster Recovery Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Techno...

Page 109: ...R center After synchronization pair running status returns to normal 12 Run services on the production host OceanStor V3 Series Remote Replication Feature Guide for Block 5 Disaster Recovery Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 101 ...

Page 110: ...u can synchronize the remote replication pair to ensure data consistency 6 4 Splitting a Remote Replication Pair If you want a secondary resource to save data on a primary resource at a specific point in time maintain a remote replication link or expand network bandwidth you must split the remote replication pair After a remote replication pair is split the data written into the primary resource b...

Page 111: ... effectively monitor the status of remote replication Procedure Step 1 Log in to DeviceManager Step 2 Choose Data Protection Remote Replication Remote Replication Pair Step 3 View the information about remote replication pairs Table 6 1 describes related parameters NOTE On the remote replication management page you can do the following l Click and select the pair information items you want to view...

Page 112: ...you cannot perform the synchronization operation temporarily l To be recovered After the remote replication internal I O error is rectified or the replication link is up and if Recovery Policy is Manual the pair enters this status You need to manually start synchronization for the pair to synchronize data l Invalid The pair is useless and cannot be restored in this status except deleting it You mu...

Page 113: ...is rectified or the replication link is up the remote replication pair automatically synchronizes data or not The values include l Manual The pair enters the To be recovered state You need to manually synchronize the data from the primary resource to the secondary resource in the pair l Automatic The pair enters the Synchronizing state The system will automatically synchronize data from the primar...

Page 114: ...nchronized is only applied for synchronous remote replication Status of Secondary Resource Protection The data status of secondary resource protection includes l Read only Data of the secondary LUN is only readable l Read Write Data of the secondary LUN is readable and writable Data Transmission During primary and secondary resource synchronization data is compressed or not If it is data compressi...

Page 115: ...o the secondary resource The values include l Manual The synchronization operation must be carried out manually l Timed wait when synchronization begins The system starts timing as soon as the latest synchronization begins When the time specified in Interval has elapsed the system automatically starts to synchronize data between the primary resource and secondary resource again NOTE If the latest ...

Page 116: ...High When the speed is set to high remote replication will take a short period This value is applicable to scenarios where the service load is relatively light The speed is normally from 50 to 70 MB s l Highest When the speed is set to highest remote replication will be complete in the shortest period This value is applicable to scenarios where the service load is light The speed is normally above...

Page 117: ... Step 4 Modify properties of the remote replication pair Table 6 3 describes related parameters Table 6 3 Remote replication parameters Parameter Description Value Status of Secondary Resource Protection The status of secondary resource protection includes l Read only Data of the secondary LUN is only readable l Read Write Data of the secondary LUN is readable and writable Example Read only NOTE Y...

Page 118: ...s to synchronize data between the primary resource and secondary resource again Example Manual NOTE This parameter is available only when Replication Mode is set to Asynchronous Interval Time spent waiting of the two synchronization methods Timed wait when synchronization begins and Timed wait when synchronization ends NOTE This parameter is available when Replication Mode is set to Asynchronous a...

Page 119: ...ed is normally from 50 to 70 MB s l Highest When the speed is set to highest remote replication will be complete in the shortest period This value is applicable to scenarios where the service load is light The speed is normally above 100 MB s Example High Recovery Policy Policy applied by a remote replication to recover after the storage system recovers from a failure The value can be Manual or Au...

Page 120: ...imeout threshold for the secondary LUN If data is written into the primary LUN but fails to be written into the secondary LUN when the timeout period you set has elapsed the remote replication pair enters the Interrupted status Default value Disabled NOTE This parameter is available only when Replication Mode is set to Synchronous Timeout Threshold second The timeout for data written into the seco...

Page 121: ...6 4 Status requirements for synchronizing a remote replication pair Pair Running Status Synchronizing a Synchronous Remote Replication Pair Synchronizing an Asynchronous Remote Replication Pair Normal Split Interrupted Link down Interrupted Link up To be recovered Synchronizing N A Invalid Able to operate Unable to operate Procedure Step 1 Log in to DeviceManager Step 2 Choose Data Protection Remo...

Page 122: ...r determine whether the remote replication pair can be split as shown in Table 6 5 Table 6 5 Status requirements for splitting a remote replication Pair Running Status Splitting a Synchronous Remote Replication Pair Splitting an Asynchronous Remote Replication Pair Normal Split Interrupted Link down Can be performed on the primary storage system only Can be performed on the primary storage system ...

Page 123: ...ication pair for which you want to initiate a primary secondary switchover is not added to a consistency group l Primary Secondary switchover can be performed when synchronous remote replication is in the following states Pair Running Status is Normal Secondary Resource Data Status is Synchronized and Status of Secondary Resource Protection is Read only Pair Running Status is Split Secondary Resou...

Page 124: ... and select a LUN whose owning controller needs to be switched and click NOTE If the operation is performed at the primary site the owning controller of primary LUNs will be switched If the operation is performed at the secondary site the owning controller of secondary LUNs will be switched Step 5 Click OK If the Execution Result dialog box is displayed the operation succeeds Step 6 Click Close En...

Page 125: ...6 Table 6 6 Status requirements for deleting a remote replication Pair Running Status Deleting a Remote Replication Pair Normal Split Interrupted To be recovered Synchronizing Invalid Able to operate Unable to operate Context l The essence of deleting a remote replication pair is to delete the remote replication configuration information of the primary and secondary resources thereby to cancel the...

Page 126: ...d In such scenarios this option is mandatory Otherwise the pair cannot be deleted If you want to delete the configuration information of remote replication from the remote storage system you must perform this operation in the remote storage system NOTE If the physical link is normal do not select this option Forcibly ensure data consistency for the secondary resource If the secondary resource data...

Page 127: ...chronization s Time Difference s and Synchronization Duration s Table 6 8 explains the indicators Table 6 8 Running status of a remote replication pair Performance Indicator Definition Block Bandwidth MB s Volume of data transmitted per second without being compressed Logical Bandwidth MB s Volume of data transmitted per second without being compressed Interval since last synchronization s Time pa...

Page 128: ...since last synchronization s Time Difference s and SynchronizationDuration s d View real time performance data on the right function pane As shown in Figure 6 1 graphs of the performance indicators are displayed NOTE n You can click in the upper right corner to view details of the performance data n When you move the mouse pointer over a performance data sampling point in the graph the correspondi...

Page 129: ...As shown in Figure 6 2 graphs of the performance indicators are displayed NOTE n You can click in the upper right corner to view details of the performance data n When you move the mouse pointer over a performance data sampling point in the graph the corresponding sampling value and time are displayed Figure 6 2 Viewing real time performance monitoring data multi figure display End OceanStor V3 Se...

Page 130: ... is generated for each secondary LUN in each pair facilitating report generation test data mining decision making and data recovery 7 5 Performing Primary Secondary Switchover of a Consistency Group This operation enables you to switch between the primary LUNs and the secondary LUNs in a consistency group When the primary LUNs in a consistency group fail you can initiate a primary secondary switch...

Page 131: ... basic information and remote replication pair information so that you can effectively monitor the status of consistency groups Context l On the consistency group management page you can click Refresh to refresh consistency group information l On the consistency group management page you can click Keyword and enter keywords to search for the desired consistency group information l On the consisten...

Page 132: ...rupted The remote replication internal I O error or the replication link is down and you cannot perform the synchronization operation temporarily l To be recovered After the remote replication internal I O error is rectified or the replication link is up and if Recovery Policy is Manual the consistency group enters this status You need to manually start synchronization for the consistency group to...

Page 133: ...ed to the secondary site reducing the write latency of application server to the minimum Role The local resource of the remote replication pair in the consistency group is the primary resource or not If the local resource is the primary resource it displays as Primary Otherwise it displays as Secondary Recovery Policy After the remote replication internal I O error is rectified or the replication ...

Page 134: ...ely heavy The speed is normally from 10 to 20 MB s l High When the speed is set to high remote replication will take a short period This value is applicable to scenarios where the service load is relatively light The speed is normally from 50 to 70 MB s l Highest When the speed is set to highest remote replication will be complete in the shortest period This value is applicable to scenarios where ...

Page 135: ... as a synchronization operation is completed When the time indicated by Interval has elapsed the system starts synchronizing data again Interval Waiting time for the two synchronization methods Timed wait after synchronization begins and Timed wait after synchronization ends NOTE When the primary end model is 2200 V3 the resource type is LUN the unit can only be minutes and the interval is an inte...

Page 136: ... last replication Start Time Start time of data synchronization of primary and secondary resources End Time End time of data synchronization of primary and secondary resources Step 4 Click the desired consistency group and view its remote replication information The following Table 7 2describes the related parameters Table 7 2 Parameters of a remote replication pair Parameter Description Local Res...

Page 137: ... is rectified or the replication link is up and if Recovery Policy is Manual the pair enters this status You need to manually start synchronization for the pair to synchronize data l Invalid The pair is useless and cannot be restored in this status except deleting it You must delete the pair on both primary and secondary storage devices Otherwise the pair creation may fail NOTE When the running st...

Page 138: ...ta synchronization later only the different data the primary site records are synchronized to the secondary site reducing the write latency of application server to the minimum NOTE File system is only supported by asynchronous remote replication Recovery Policy A recovery policy supports the following recovery modes l Manual The remote replication pair enters the To be recovered state Remote repl...

Page 139: ...rimary resource Data availability is the highest l Consistent Data in the secondary resource is a duplicate of the data in the primary resource at the time the latest successful synchronization starts In this state data in the secondary resource is available but not necessarily the same as the current data in the primary resource l Inconsistent Data in the secondary resource is not a duplicate of ...

Page 140: ...y Resource Protection The values are as follows l Read only Data of the secondary LUN is only readable l Read Write Data of the secondary LUN is readable and writable Time Difference Synchronization time difference between the primary and secondary storage systems l When Pair Running Status is Normal this field indicates the time difference between the current time and the start time of the curren...

Page 141: ...g box is displayed Step 4 Modify properties of the consistency group Table 7 3 describes the related parameters Table 7 3 Parameters of a consistency group Parameter Description Setting Name Name of a consistency group Value range l The name must be unique l The name must start with a digit or letter and contain only letters digits periods underscores _ and hyphens l The name contains 1 to 31 char...

Page 142: ...ynchronization ends The system starts timing as soon as a synchronization ends When the time specified in Interval has elapsed the system starts to synchronize data again NOTE This parameter is available only when Replication Mode is set to Asynchronous Example Manual Interval Waiting time for the two synchronization methods Timed wait after synchronization begins and Timed wait after synchronizat...

Page 143: ...Example Medium Recovery Policy After the remote replication internal I O error is rectified or the replication link is up the consistency group automatically synchronizes data or not The values include l Manual The consistency group enters the To be recovered state You need to manually synchronize the data from the primary resource to the secondary resource l Automatic The consistency group enters...

Page 144: ...Group This operation enables all remote replication pairs contained in a consistency group to initiate data synchronization simultaneously so that data is synchronized from all primary LUNs to all secondary LUNs at the same point in time ensuring data validity Prerequisites l This operation can be performed only on the primary device of a consistency group l Secondary resource protection has been ...

Page 145: ...ion Consistency Group Step 3 Right click the desired consistency group and choose Synchronize The security alert dialog box is displayed Step 4 Confirm the synchronization operation 1 Carefully read the contents of the dialog box Select I have read and understand the consequences associated with performing this operation and click OK to confirm the information 2 Click OK The Success dialog box is ...

Page 146: ...mote replication tasks the consistency groups cannot guarantee data consistency Procedure Step 1 Log in to DeviceManager Step 2 Choose Data Protection Remote Replication Remote Replication Consistency Group Step 3 Right click the desired consistency group and choose Split The security alert dialog box is displayed Step 4 Confirm the operation of splitting remote replications in the consistency gro...

Page 147: ...cy group as shown in Table 7 6 Table 7 6 Status requirements for initiating a primary secondary switchover for a consistency group Running Status of a Consistency Group Secondary Resource Data Status of Remote Replications Initiating a Primary Secondary Switchover for a Synchronous Consistency Group Initiating a Primary Secondary Switchover for an Asynchronous Consistency Group Normal Synchronized...

Page 148: ...rce cannot be written to ensure the security of the data from the secondary resource Prerequisites Based on Running Status of a consistency group and Secondary Resource Data Status of the remote replications added to the consistency group determine whether protection for the secondary resource can be enabled for the consistency group as shown in Table 7 7 Table 7 7 Status requirements for enabling...

Page 149: ...f a consistency group and Secondary Resource Data Status of the remote replications added to the consistency group determine whether disable protection for secondary resource can be performed for the consistency group as shown in Table 7 8 Table 7 8 Status requirements for disabling protection for secondary resource Pair Running Status Secondary Resource Data Status Disabling Protection for the Se...

Page 150: ...e added into the consistency group must be Primary l The number of remote replication pairs in a consistency group does not reach the maximum number of specifications Precautions l If the consistency group is in split status when a remote replication pair is added the system will split the remote replication pair first and then add it into the consistency group l If the consistency group is not in...

Page 151: ...e replication pairs in the consistency group in terms of synchronization point in time Prerequisites l The consistency group is split l A remote replication pair can be removed only when the Role of the consistency group is Primary Precautions l When a remote replication pair cannot be removed due to a link failure delete the consistency group to which the remote replication belongs l Once a remot...

Page 152: ...eleted as shown in Table 7 9 Table 7 9 Status requirements for deleting a consistency group Running Status Deleting a Consistency Group Normal Split Interrupted To be recovered Synchronizing Invalid Able to operate Unable to operate Precautions l The essence of deleting a consistency group is to delete the consistency group configuration information stored on both local and remote storage device I...

Page 153: ... such scenarios this option is mandatory Otherwise the pair cannot be deleted If you want to delete the configuration information of the consistency group from the remote storage device you must perform this operation in the remote storage system If the physical link is normal do not select this option 2 Carefully read the contents of the dialog box Select I have read and understand the consequenc...

Page 154: ...ted remote device 8 3 Modifying the Advanced Properties of a Remote Link This operation enables you to modify the bandwidth and bandwidth utilization of a link 8 4 Deleting a Remote Link This operation enables you to remove unwanted links between a local storage device and a remote storage device 8 5 Removing a Remote Device This operation enables you to remove unwanted remote storage devices 8 1 ...

Page 155: ...inks Number of FC links between a local storage device and a remote device Example 2 Number of iSCSI Links Number of iSCSI links between a local storage device and a remote device Example 2 Step 4 Select remote storage devices that you want to view and view the information about FC links and iSCSI links of the remote storage devices Table 8 2 and Table 8 3 list related parameters of FC links and i...

Page 156: ...f a link Example No Bandwidth Size Maximum data transfer rate of a link Example Bandwidth Usage Usage of the link bandwidth Example Local Port WWPN Unique identifier of the local Fibre Channel port Example 22019c37f48fXXXX Remote Port WWPN Unique identifier of the remote Fibre Channel port Example 22019c37f496XXXX Table 8 3 Information about iSCSI links of the remote storage devices Parameter Desc...

Page 157: ... X Bandwidth Limit Whether or not to limit the data transfer rate of a link Example Yes Bandwidth Maximum data transfer rate of a link Example Bandwidth Usage Usage of the link bandwidth Example End 8 2 Modifying Remote Device Information This operation enables you to change the information of a replicated remote device Procedure Step 1 Log in to DeviceManager Step 2 Choose Data Protection Remote ...

Page 158: ... remote devices are OceanStor 18000 series V100R001C10 T series V200R002C10 or OceanStor V3 series V300R001C00 or earlier you need to use the super administrator or administrator account on the older version remote device Value The default username of the machine machine user is mm_user Obtain the super administrator or administrator account on the remote device OceanStor V3 Series Remote Replicat...

Page 159: ... device Value The default password of the machine machine user is mm_user stor age NOTE You are advised to change your login password periodically in the future by executing the change mm_user password command This reduces the password leakage risks For details about how to use the command see the Command Reference of the corresponding product model The password of the super administrator or admin...

Page 160: ... ratio Fast High Performance priority to ensure the performance Deep high compression ratio priority to ensure the compression ratio Example Fast High Performance 3 Click OK The Success message box is displayed indicating that the operation succeeded 4 Click OK End 8 3 Modifying the Advanced Properties of a Remote Link This operation enables you to modify the bandwidth and bandwidth utilization of...

Page 161: ...xample 90 Step 5 Confirm the modification of the advanced properties of the remote link 1 Click OK The security alert dialog box is displayed 2 Confirm the information in the dialog box and select I have read and understand the consequences associated with performing this operation 3 Click OK The Execution Result message box is displayed indicating that the operation succeeded 4 Click Close End 8 ...

Page 162: ...on 2 Click OK The Success message box is displayed indicating that the operation succeeded 3 Click OK End 8 5 Removing a Remote Device This operation enables you to remove unwanted remote storage devices Prerequisites A remote device exists in the system and the remote device does not run the inter array remote replication LUN copy or clone service Procedure Step 1 Log in to DeviceManager Step 2 C...

Page 163: ... device 1 Confirm the information in the dialog box and select I have read and understand the consequences associated with performing this operation 2 Click OK The Success message box is displayed indicating that the operation succeeded 3 Click OK End OceanStor V3 Series Remote Replication Feature Guide for Block 8 Managing Remote Devices Issue 06 2018 01 30 Huawei Proprietary and Confidential Cop...

Page 164: ...Reserved Space for an Asynchronous Remote Replication Task 9 8 Impact of Modifying Consistency Group Properties 9 9 When Performing a Remote Replication Task Is an Initial Synchronization Required to Synchronize Data from the Primary Storage System to the Secondary Storage System 9 10 Do I need to stop the services on the primary storage system before performing the initial synchronization 9 11 Im...

Page 165: ...ures real time data synchronization between the primary LUN and the secondary LUN Asynchronous remote replication When writing data to the primary LUN the primary site records the changed data After the primary LUN returns a write success response the primary site returns a write success response to the host Then data synchronization is performed manually or automatically based on user defined tri...

Page 166: ...updated in real time Answer The symptoms and reasons are as follows l Symptom 1 After data synchronization between the primary LUN and the secondary LUN is initiated the secondary device does not display the synchronization progress in real time To display the synchronization progress in real time during data synchronization the secondary device must send a query task to the primary device This af...

Page 167: ...the consistency group at the same time ensuring data consistency among multiple LUNs 9 5 What Is the Principle of Setting Bandwidth for Remote Replication and LUN Copy among Storage Arrays Question What is the bandwidth for remote replication and LUN copy among storage arrays be to achieve the optimal system performance Answer The bandwidth refers to the amount of data that is transferred on a cha...

Page 168: ...ce COW for host I Os or data synchronization I Os of the secondary storage array fails due to insufficient space As a result the remote replication session enters the split state You are advised to reserve 30 of LUN space in an asynchronous remote replication task for copy on write When configuring an asynchronous remote replication task reserve certain space in the storage pool of the secondary s...

Page 169: ... consistency group properties have on pairs in the consistency group Answer After the properties of a consistency group are modified the properties of pairs in the consistency group keep unchanged However the working properties depend on the properties of the consistency group After a member whose rate is Medium is added to a consistency group and the rate of the consistency group is changed to Hi...

Page 170: ...ndary storage system is powered off or faulty services running on the primary storage system are not affected but the remote replication relationship is interrupted The primary storage system records changes after the remote replication relationship is interrupted in the Data Change Log DCL bitmap After the secondary storage system is recovered the remote replication relationship can be restored b...

Page 171: ...ero data is compressed to 4 KB 16 1 synchronized to the secondary LUN decompressed to 64 KB and then written to the secondary LUN Other data is written to the secondary LUN in sequence The amount of data to be transmitted is reduced to fully tap into bandwidth resources As a result the logical bandwidth and the replication link bandwidth are not the same In addition the logical bandwidth of an asy...

Page 172: ...the connection The TOE interface module is the receiving end of the connection Establish the connection oppositely This method helps establish the link Method 2 On the storage system where the non TOE interface module resides run the tcp_recycle_switch sh command to disable the function of quickly recycling TIME_WAIT socket in the TCP connection After the link is established enable the function a ...

Page 173: ...to create remote replication pairs Secondary LUNs that have different capacity with the primary LUNs calculated in blocks or LUNs that are mapped to the host are all filtered out Locate and rectify the cause If the secondary LUN is still not displayed when the remote replication pair is created contact technical support engineers OceanStor V3 Series Remote Replication Feature Guide for Block 9 FAQ...

Page 174: ... external storage system to implement initial synchronization for a remote replication A 3 Configuration Operation Using the LUN Copy Feature of the Production and DR Centers You can create a LUN copy on the storage system of the production center and DR center to implement initial synchronization for a remote replication A 1 Introduction After a remote replication is established between the produ...

Page 175: ...center Methods for performing initial synchronization for a remote replication using the external storage system vary with provider of the LUN copy feature l Method 1 Use the snapshot feature of the production center and the LUN copy feature of the production and DR centers and create LUN copies in the production center and the DR center respectively l Method 2 Use the snapshot feature of the prod...

Page 176: ...r to the external storage system 1 Create and activate a snapshot for the primary LUN of the production center The snapshot is created and activated 2 Log in to the external storage system and create a full LUN copy The source LUN of the LUN copy is the snapshot for the storage system of the production center and the target LUN is the LUN of the external storage system The full LUN copy is created...

Page 177: ...rite back NOTE In developer mode run the change lun lun_id write_policy write_back command Step 9 Start the remote replication from the production center to the DR center End A 3 Configuration Operation Using the LUN Copy Feature of the Production and DR Centers You can create a LUN copy on the storage system of the production center and DR center to implement initial synchronization for a remote ...

Page 178: ... 3 Start the full LUN copy The full LUN copy is started and its Running Status is Copying After the full LUN copy is complete its Running Status becomes Completed 4 Delete the full LUN copy The full LUN copy is deleted 5 Log in to the storage system of the production center and deactivate and delete the snapshot The snapshot is deactivated and deleted Step 3 Move the external storage system to the...

Page 179: ... support and onsite technical support B 4 Ways to Contact Huawei Huawei Technologies Co Ltd provides customers with comprehensive technical support and service For any assistance contact our local office or company headquarters B 1 Preparations for Contacting Huawei To better solve the problem you need to collect troubleshooting information and make debugging preparations before contacting Huawei ...

Page 180: ...sers with timely and efficient technical support through the regional offices secondary technical support system telephone technical support remote technical support and onsite technical support Contents of the Huawei technical support system are as follows l Huawei headquarters technical support department l Regional office technical support center l Customer service center l Technical support we...

Page 181: ...l and select a path from the paths that are automatically displayed to go to the document page of the product Browse or download the OceanStor V3 Series V300R006 Glossary OceanStor V3 Series Remote Replication Feature Guide for Block C Glossary Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 173 ...

Page 182: ...nel I IP Internet Protocol IPv4 Internet Protocol version 4 IPv6 Internet Protocol version 6 IQN iSCSI Qualified Name iSCSI Internet Small Computer Systems Interface L LUN Logical Unit Number OceanStor V3 Series Remote Replication Feature Guide for Block D Acronyms and Abbreviations Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 174 ...

Page 183: ...mber T TCP Transmission Control Protocol 3DC Three Data Center U UTC Universal Time Coordinated V VVol Virtual Volume W WAN Wide Area Network WWPN World Wide Port Name WWN World Wide Name OceanStor V3 Series Remote Replication Feature Guide for Block D Acronyms and Abbreviations Issue 06 2018 01 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 175 ...

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