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Appendix B:

etting up and Managing Multipath

torage

Gateway specific requirements for Multipath Storage

System
requirements

Multipath Storage is supported on all gateways that support native disk shelves.
See the gateway

Interoperability Matrix

for a list of the gateways supported.

HA pair type
requirements

Multipath Storage is available for the following types of gateway HA pairs:

◆

Standard HA pairs

◆

Mirrored HA pairs

Note

The gateway does not support MetroCluster with native disk shelves.

Disk shelf
requirements

See the gateway

Interoperability Matrix

for a list of the combinations of disk

shelves and modules supported in HA pairs with Multipath Storage.

Note

Only AT-FCX modules shipped in December 2005 or later support Multipath
Storage for HA pairs. If you are unsure whether your module is the correct
version, see the Data ONTAP

High Availability Configuration Guide

Data

ONTAP

Active/Active Configuration Guide

for the procedure for checking the

version of the AT-FCX module.

Summary of Contents for N Series

Page 1: ...IBM System Storage N series Gateway Implementation Guide for Native Disk Shelves GC27 2188 03 NA 210 04520_A0...

Page 2: ...n electronic retrieval system without prior written permission of the copyright owner Software derived from copyrighted NetApp material is subject to the following license and disclaimer THIS SOFTWARE...

Page 3: ...Vault SyncMirror Topio VFM VFM Virtual File Manager and WAFL are registered trademarks of NetApp Inc in the U S A and or other countries gFiler Network Appliance SnapCopy Snapshot and The evolution of...

Page 4: ...tional information visit the web at http www ibm com ibm licensing contact The following paragraph does not apply to the United Kingdom or any other country where such provisions are inconsistent with...

Page 5: ...re some measurement may have been estimated through extrapolation Actual results may vary Users of this document should verify the applicable data for their specific environment Information concerning...

Page 6: ...vi Notices...

Page 7: ...disks and array LUNs 16 Considerations when planning storage requirements 20 Guidelines for creating aggregates 21 Considerations when planning for the root volume 24 Guidelines for gateway port usage...

Page 8: ...t 56 Assigning disks and array LUNs to the gateway 60 Appendix A Configuring Gateway Ports as Initiators 63 Appendix B Setting up and Managing Multipath Storage 65 Description of Multipath Storage 66...

Page 9: ...ler functionality is provided by the back end disk storage system A gateway might also be used with disk storage expansion units specifically designed for the IBM N series models The term filer descri...

Page 10: ...her and for installing Data ONTAP on a gateway that uses only third party storage Reference information Detailed background information including layout in aggregates and checksums Implementation Guid...

Page 11: ...roperly Check the power switches to make sure that the system is turned on Use the troubleshooting information in your system documentation and use the diagnostic tools that come with your system Usin...

Page 12: ...following Web site www ibm com storage support nas Verify that the latest level of firmware is installed on your machine before contacting IBM for technical support See the Gateway Upgrade Guide for...

Page 13: ...this manual is missing you can direct your mail to International Business Machines Corporation Information Development Dept GZW 9000 South Rita Road Tucson AZ 85744 0001 U S A When you send informati...

Page 14: ...xiv Preface...

Page 15: ...tting up array LUNs from third party storage array vendors with gateways see other guides in the gateway library particularly the implementation guides Topics in this chapter This chapter contains the...

Page 16: ...s HA pairs are sometimes also referred to as clusters or active active configurations native disks native disk shelves Disks and disk shelves that are sold as local storage for systems that run Data O...

Page 17: ...Chapter 1 Implementation Overview 3 Disk management Chapter 6 Managing a System with Disks and Array LUNs on page 55 Data ONTAP Storage Management Guide For information about See...

Page 18: ...nd native disks The gateway can virtualize storage from both third party storage array vendors and native disk shelves The Data ONTAP software provides a unified storage software platform that simplif...

Page 19: ...e disk shelf to an existing gateway Move a disk shelf from an N series storage system to a gateway or between gateways Using only native disk shelves with gateways Although typical gateways that use n...

Page 20: ...s initial setup of the system is easier because the factory performs some installation tasks that must be performed at the customer site for systems without native disk shelves Tasks performed by the...

Page 21: ...Chapter 1 Implementation Overview 7 See SnapLock Compliance aggregates on page 22 for more information...

Page 22: ...lves starting in Data ONTAP 7 3 gateways continue to be the only systems running Data ONTAP that can support third party storage arrays You cannot convert an N series storage system to a gateway or co...

Page 23: ...trix at http www ibm com storage nas is updated more frequently than this guide The gateway Interoperability Matrix is the final authority about which gateway models and Data ONTAP releases support di...

Page 24: ...e procedure for checking the version of the AT FCX module Native disk shelves that the gateway supports Gateway models that support disk shelves support the same disk shelves and the same disk types p...

Page 25: ...e not the B port on the storage controller or host bus adapter On a stand alone system you can use one or two connections between the storage controller and the disk shelf Using two connections provid...

Page 26: ...AID protection for Data ONTAP aggregates Within its RAID groups Data ONTAP allots one disk for holding parity data and one disk for holding double parity data Double parity protection ensures against...

Page 27: ...Chapter 1 Implementation Overview 13 You can use only block checksums for native disk shelves In contrast you can use either block checksums or zoned checksums with array LUNs...

Page 28: ...14 Understanding storage provided by native disk shelves...

Page 29: ...ys Topics in this chapter This chapter contains the following topics Comparing how Data ONTAP functions work with disks and array LUNs on page 16 Considerations when planning storage requirements on p...

Page 30: ...m You cannot change the checksum type If you are planning to move older zoned checksum disks to your gateway see the Data ONTAP Storage Management Guide for the rules for assigning zoned checksum disk...

Page 31: ...you can establish one or two paths between the gateway controller and the disk shelf Two paths are required for redundancy For an HA pair you must use the Multipath Storage feature if you want redund...

Page 32: ...eature You must configure redundant paths to an array LUN root volume The root volume can be installed either on a native disk or an array LUN See Considerations when planning for the root volume on p...

Page 33: ...ply to native disk shelves attached to a gateway However when disks are attached to a system in the neighborhood that uses both disks and array LUNs you must count the disks toward the visible limit S...

Page 34: ...arrays do you want this gateway to own and what should the checksum type of each be Which native disks do you want this gateway to own Where do you want to locate the root volume See Considerations wh...

Page 35: ...LUNs from storage arrays from different vendors Array LUNs from storage arrays from different families Note Storage arrays in the same family share the same characteristics See the gateway Implementat...

Page 36: ...Note SnapLock Compliance requires an additional license SnapLock Compliance is not supported in all Data ONTAP releases See the gateway Interoperability Matrix to determine if it is supported with yo...

Page 37: ...trators might want to make For example a storage array administrator could destroy an array LUN that Data ONTAP is using which would result in noncompliance For more information about SnapLock Complia...

Page 38: ...steps to perform If you order a gateway with disk shelves your system is delivered with the root volume and with three disks a RAID DP aggregate with one parity disk and two data disks The root volume...

Page 39: ...HA pair it is highly recommended that the root volume be located on the same type of storage for both nodes either on a disk shelf for both nodes or on an array LUN for both nodes Although an asymmetr...

Page 40: ...redundant initiator ports on the gateway to access each LUN group on the storage array Number of ports required to connect to a disk shelf You need to use the following number of ports to connect the...

Page 41: ...pairs are as follows 0a and 0c 0b and 0d If you are using 0a and 0c as the redundant port pair to access array LUNs 0b and 0d is the redundant port pair to access the disk shelf See the Data ONTAP Hi...

Page 42: ...ollowing documents provide details about the limits Limit type Document Per platform limits for minimum and maximum system capacity Gateway Interoperability Matrix Maximum number of disks and array LU...

Page 43: ...apter discusses the following topics Factory default setup of a gateway with disk shelves on page 30 Installing a gateway with disk shelves on page 32 If you See instead Are adding a disk shelf to an...

Page 44: ...ic environment variable for the gateway before cabling and configuring the nodes for Multipath Storage See Configuring the gateway environment variable for Multipath Storage on page 71 for information...

Page 45: ...ith the system Disks Disks with the latest firmware are installed Gateway port settings The gateway ports might or might not be set as initiators They must be set as initiators to connect to either a...

Page 46: ...gateway to own Prerequisites to booting the new gateway Before booting the gateway for the first time complete the following If you are using third party storage as well as disk shelves prepare the s...

Page 47: ...ay 3 Turn on the power to the gateway Note It takes the LEDs on the system power supplies a few seconds to illuminate Result The system begins to boot and then stops at the first installation setup sc...

Page 48: ...as the owner of array LUNs and additional disks See Assigning disks and array LUNs to the gateway on page 60 for information about the disk assign command Note If the disk auto_assign option is enable...

Page 49: ...opics in this chapter This chapter discusses the following topics General requirements when adding a disk shelf on page 36 Overview of adding a new disk shelf on page 38 If you See instead Are setting...

Page 50: ...an error message might be generated the gateway might panic or the gateway might not be able to see the disks on the disk shelf Availability of the gateway while a disk shelf is being added You can a...

Page 51: ...ultipath Storage feature to connect disk shelves to the gateway you must configure the fc non array adapter list environment variable before you connect the first disk shelf on a new loop See Appendix...

Page 52: ...u can find detailed procedures Step Action Details 1 Review the restrictions for adding disk shelves See the following guides Appropriate Storage Expansion Unit Hardware and Service Guide Data ONTAP H...

Page 53: ...ation Guide about adding new loops and adding storage to an existing loop 6 Assign the disks to your gateway 1 At the system console enter the following command to determine the type of disks on the d...

Page 54: ...command 8 Configure aggregates on your system Follow the guidelines in Restrictions on mixing storage types in an aggregate on page 21 Example The following command creates an aggregate called vs23b3...

Page 55: ...n page 42 Tasks to perform before disconnecting the shelf on page 46 Process overview for physically moving the disk shelf on page 52 Optional configuration after moving the disk shelf on page 53 Movi...

Page 56: ...least Data ONTAP 7 3 before you move the disk shelf to the gateway Loop speed requirements If you are moving a disk shelf to an existing gateway be sure that you understand the characteristics of the...

Page 57: ...ot need to shut down the gateway to be able to install the disk shelf on it You can hot add disk shelves on the gateway that is add disk shelves without shutting the system down If Then You still need...

Page 58: ...d to be created and the UNC path will likely change NFS Volumes need to be exported on the new system with a new path Users must remount to the new location iSCSI igroups need to be created on the new...

Page 59: ...nd volumes on the disk shelf you are moving and the gateway All aggregate names and volume names on the same system must be unique If you want to preserve the data on the disk shelf you need to determ...

Page 60: ...the root volume for the N series storage system move the root volume to another disk shelf that is to remain with the N series storage system If you need to move the root volume to another disk shelf...

Page 61: ...vant procedure Step Action 1 For Data ONTAP 8 0 7 Mode and 7 x releases enter the following command sysconfig r The output from this command shows information about all aggregates volumes file system...

Page 62: ...name the duplicate aggregate name on one of the systems Go to Renaming an aggregate on page 48 There are duplicate volume names You need to rename the duplicate volume name on one of the systems See R...

Page 63: ...me new name is the new name of the volume Result The following events occur The volume is renamed If NFS is in use and the nfs exports auto update option is On the etc exports file is updated to refle...

Page 64: ...lowing steps Changing the disk owner to the gateway To change the assignment of disks on the disk shelf from the N series storage system to the gateway complete the following steps Step Action 1 For D...

Page 65: ..._system name old_systemname is the system name or NVRAM ID associated with the N series storage system new_systemname is the system name or NVRAM ID of the gateway to which you are moving the disk she...

Page 66: ...e disk shelf from it See the appropriate guide for your disk shelf 2 Connect the disk shelf to the gateway controller ground the Fibre Channel disk shelves and the controller and connect the disk shel...

Page 67: ...a on the disk shelf If you want the automatic disk assignment functionality after the shelf is moved you must reenable it after you finish moving the disk shelf and then reassigning the disks on the d...

Page 68: ...talled on a gateway Moving a disk shelf that is installed on a gateway You can move a disk shelf that is installed on a gateway to another gateway or to an N series storage system if the destination s...

Page 69: ...inform you about any differences in managing disks and array LUNs Topics in this chapter This chapter discusses the following topics Identifying disk and array LUN information in command output on pa...

Page 70: ...the slot number on the gateway to which the host adapter is attached as shown in the following examples 0a for a disk shelf attached to an onboard Fibre Channel port 7a for a shelf attached to the A p...

Page 71: ...nected to your gateway When the T option is used with the storage show disk command the disk type is shown If your output from the storage show disk T command is truncated try adding the x option eith...

Page 72: ...V5Y6E86A NETAPP X274_HPYTA146F10 NA03 FCAL c 19 1 3 3KS638PR00009728VEUS NETAPP X274_S10K7146F10 NA07 FCAL c 20 1 4 V5Y6A12A NETAPP X274_HPYTA146F10 NA03 FCAL c 21 1 5 V5Y6HA3A NETAPP X274_HPYTA146F1...

Page 73: ...rial number is a combination of a unique identifier for the storage array and the internal logical device number by which the storage array identifies the LUN Vendor For disks This column always shows...

Page 74: ...ing command disk assign disk_name all n count T disktype p pool c block zoned disk_name all n count Required option Identifies the disks and array LUNs assigned to this gateway Parameters are as follo...

Page 75: ...parameter p The pool parameter defaults to 0 zero If you are going to be deploying SyncMirror you must use the pool parameter with array LUNs and you must enter it correctly See the information about...

Page 76: ...needs to be formatted by the gateway in either of two ways Block checksum Reserves 12 5 percent of the space in the array LUN for checksum Zoned checksum An array LUN of type block is expected to be...

Page 77: ...r for redundancy The factory might not have set the initiator port pairs in this manner Changing target ports to initiator ports Complete the following steps to ensure that gateway HBAs are configured...

Page 78: ...64 Configuring Gateway Ports as Initiators...

Page 79: ...ive Active Configuration Guide for information about cabling and configuration for Multipath Storage that pertains to both N series storage systems and gateways Note The Multipath Storage feature is n...

Page 80: ...ath Storage for HA pair The advantages of Multipath Storage are as follows The loss of a disk shelf module connection or host bus adapter HBA does not require a failover The same node can continue to...

Page 81: ...HA pairs Mirrored HA pairs Note The gateway does not support MetroCluster with native disk shelves Disk shelf requirements See the gateway Interoperability Matrix for a list of the combinations of dis...

Page 82: ...iable setting Configure the fc non array adapter list environment variable for each new loop before you connect and configure the shelf for Multipath Storage See Setup overview Multipath Storage on an...

Page 83: ...unning Data ONTAP 7 3 or higher you must upgrade your software Data ONTAP Upgrade Guide Gateway specific Multipath Storage setup requirement 3 On each node configure the fc non array adapter list envi...

Page 84: ...Multipath Storage Data ONTAP High Availability Configuration Guide or Data ONTAP Active Active Configuration Guide Completing your setup 6 Assign the new disks to the gateway if you do not have automa...

Page 85: ...ribes how to set the gateway required environment variable called fc non array adapter list to identify the gateway initiator ports that you are connecting to the disk shelf To set the environment var...

Page 86: ...enter the following command to force vs1 to take over vs2 cf takeover 3 On vs2 interrupt the boot process by pressing Ctrl C when you see the following message on the console Starting AUTOBOOT press...

Page 87: ...clude a space between initiator port names and you have not enclosed the ports in quotes then Data ONTAP ignores the initiator port names after the space 6 On vs2 enter the following command to verify...

Page 88: ...to start giveback to vs2 then wait for vs2 to boot fully cf giveback To set the environment variable on vs1 10 On vs2 enter the following command to force vs2 to take over vs1 cf takeover 11 Repeat t...

Page 89: ...ations that use native disk shelves Topics in this appendix This appendix contains the following topics Common problems on page 76 Error messages on page 78 Reinstalling the system on page 80 Determin...

Page 90: ...Not all disks are visible Verify that the cables are plugged in Verify that the disk modules are properly seated Verify that there is not a mismatch between the disk shelf and components in the same...

Page 91: ...d depends on how many disk shelves are in the loop If there are fewer than seven disk shelves in the loop Data ONTAP assigns a soft address to each disk drive on the shelves whose disk shelf IDs are d...

Page 92: ...r Multipath Storage on page 71 for instructions Note This message is issued in other circumstances that are not related to Multipath Storage on the gateway for example when array LUN IDs are duplicate...

Page 93: ...dapter 0c is invalidating disk drive 0c 14 0x0300000e which appears to have taken a soft address Expected hard address 26 0xba assigned soft address 14 0xd1 This error message is generated when there...

Page 94: ...reinstall the system and where to find the procedures that you need for each choice You need to decide how you want the disk for the root volume to be selected If you want to specify the disk for the...

Page 95: ...up program either through the command line or the Web interface using the information that you recorded in the setup parameters worksheet in the Data ONTAP Software Setup Guide 7 After the setup scrip...

Page 96: ...information about the parameters that are available for the disk assign command 6 Enter the following command disk show 7 Review the list of disks in the output to confirm that all the disks you expe...

Page 97: ...ata ONTAP Software Setup Guide 14 After the setup script is complete do the following Assign additional disks array LUNs or both to the gateway see Assigning disks and array LUNs to the gateway on pag...

Page 98: ...84 Reinstalling the system...

Page 99: ...shelves 16 boot environment variable Multipath Storage 47 68 78 booting the gateway first time how to 33 prerequisites 32 Bootloader files system firmware updates 31 C cabling of a new system HA pair...

Page 100: ...serving data requirements 45 RAID types supported for 12 root volume requirements 43 types you can move 42 understanding storage provided by 11 ways of using with gateways 6 which are supported 10 dis...

Page 101: ...sum type with 16 name format 56 LUNs See array LUNs LUNs array front end LUN M MetroCluster not supported 8 17 models supporting disk shelves 8 moving a disk shelf 41 Data ONTAP version required 42 fr...

Page 102: ...with array LUNs 18 with disk shelves 18 RAID types RAID0 described 17 supported 12 RAID4 described 12 RAID DP described 12 17 RAID0 use by gateways 12 17 RAID4 described 12 RAID DP described 12 17 re...

Page 103: ...ent 76 common problems 76 not all disks are visible 76 when disks are on gateway 75 V volumes checking names of 47 renaming 49 resolving duplicate names 46 49 root volume configuring 81 82 default loc...

Page 104: ......

Page 105: ...NA 210 04520_A0 Printed in USA GC27 2188 03...

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