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Sun StorEdge Network Data Replicator 3.0 Configuration Guide • June 2001

Configuring The Sun SNDR Software for Mutual Replication

12

Order-Dependent Writes and Volume Set Grouping

13

Recovery Considerations

14

Failing Over to the Secondary Site

14

Recovering the Primary or Secondary Site

14

Using The Sun SNDR and Sun StorEdge Instant Image Software

16

Sun SNDR Software and Sun StorEdge Fast Write Cache Software

17

One-to-Many and Multihop Volume Sets

18

Using The Sun SNDR Software in a Firewall Environment

19

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Summary of Contents for Sun StorEdge Network Data Replicator 3.0

Page 1: ...901 San Antonio Road Palo Alto CA 94303 4900 U S A 650 960 1300 Send comments about this document to docfeedback sun com Sun StorEdge Network Data Replicator 3 0 Configuration Guide Part No 806 7550 10 June 2001 Revision A ...

Page 2: ...protégé par un copyright et distribué avec des licences qui en restreignent l utilisation la copie la distribution et la décompilation Aucune partie de ce produit ou document ne peut être reproduite sous aucune forme par quelque moyen que ce soit sans l autorisation préalable et écrite de Sun et de ses bailleurs de licence s il y en a Le logiciel détenu par des tiers et qui comprend la technologie...

Page 3: ...ure 5 2 Configuration Considerations 7 Volumes Eligible for Replication 7 Choosing Volume Level Protection 8 Bitmap Volumes for Scoreboard Logs 8 Choosing a Connection Medium to Link My Sites 9 ATM Link Advantages 9 Configuring Redundant Links Between Sites 10 Link Security 10 Choosing Between Synchronous and Asynchronous Replication 11 When To Suspend Replication to the Secondary Site 12 ...

Page 4: ...and Volume Set Grouping 13 Recovery Considerations 14 Failing Over to the Secondary Site 14 Recovering the Primary or Secondary Site 14 Using The Sun SNDR and Sun StorEdge Instant Image Software 16 Sun SNDR Software and Sun StorEdge Fast Write Cache Software 17 One to Many and Multihop Volume Sets 18 Using The Sun SNDR Software in a Firewall Environment 19 ...

Page 5: ...ing environment and related disk storage systems Before You Read This Book To fully use the information in this document you must have thorough knowledge of the topics discussed in these books Sun StorEdge Network Data Replicator 3 0 System Administrator s Guide Sun StorEdge Network Data Replicator 3 0 Installation Guide Sun StorEdge Network Data Replicator 3 0 Release Notes The Sun SNDR software ...

Page 6: ...nd directories on screen computer output Edit your login file Use ls a to list all files You have mail AaBbCc123 What you type when contrasted with on screen computer output su Password AaBbCc123 Book titles new words or terms words to be emphasized Command line variable replace with a real name or value Read Chapter 6 in the User s Guide These are called class options You must be root to do this ...

Page 7: ... 3 0 Release Notes 806 7678 Installation and User Sun StorEdge Network Data Replicator 3 0 Installation Guide 806 7514 Sun StorEdge Instant Image 3 0 Installation Guide 806 7675 SunATM 3 0 Installation and User s Guide Sun ATM 4 0 Installation and User s Guide 805 0331 805 6552 Sun Gigabit Ethernet FC AL P Combination Adapter Installation Guide 806 2385 Sun Gigabit Ethernet S 2 0 Adapter Installat...

Page 8: ...tem Administrator s Guide 806 7677 Sun StorEdge Network Data Replicator 3 0 System Administrator s Guide 806 7512 TCP IP and Data Communications Administration Guide 805 4003 SunScreen 3 1 Administration Guide 806 4127 Solaris Bandwidth Manager 1 6 System Administration Guide 806 4704 Configuration Sun Enterprise 10000 InterDomain Network Configuration Guide 806 5230 Sun StorEdge Instant Image 3 0...

Page 9: ...r the latest version of storage software documentation go to http www sun com products n solutions hardware docs Software Fatbrain com an Internet professional bookstore stocks select product documentation from Sun Microsystems Inc For a list of documents and how to order them visit the Sun Documentation Center on Fatbrain com at http www fatbrain com documentation sun Sun Welcomes Your Comments S...

Page 10: ...x Sun StorEdge Network Data Replicator 3 0 Configuration Guide June 2001 ...

Page 11: ...to provide redundant storage of critical information across physically separate sites It is designed to be active during normal application access to the data volumes and it will continually replicate the data to the remote site The Sun SDNR software enables you to replicate disk volumes between physically separate primary and secondary hosts in real time To transport data the Sun SDNR software us...

Page 12: ... write has been completed on the primary volume and been placed on a per volume queue for the secondary site Subsequently the secondary site receives the queued requests in the order that they were queued Once the I O has been completed at the secondary site notification is sent to the primary In the event of planned or unplanned outages the Sun SNDR software maintains per device scoreboard bitmap...

Page 13: ...R software operates over any TCP IP networking technology but has been qualified only on 10 100 and 1000 Mbit Ethernet and ATM 166 and 622 technologies A dedicated TCP IP link is not required Operating Environment Solaris 7 or 8 operating environment or subsequent compatible version Supporting Software Network transport software such as SunATM or Gigabit Ethernet transports Optional Software Sun S...

Page 14: ...NDR software The Sun SNDR software does not natively support the functionality listed in TABLE 1 However other Sun products can be used with the Sun SNDR software to provide these facilities TABLE 1 Sun SNDR Software Related Functionality Functionality Sun Product Network interface aggregation and network alternate pathing Sun Trunking software and the native facilities provided in a Solaris opera...

Page 15: ...hitecture The Sun SNDR software operates on logical volumes that can be linear striped or RAID devices You can create the logical volumes by using the Sun Solstice DiskSuite or Veritas Volume Manager software The core Sun SNDR software code is a kernel module that interfaces to the network storage control module NSCTL data service framework The Sun SNDR software is configurable on any device that ...

Page 16: ...chitecture Primary host Application User Sun STE or SV Kernel Sun StorEdge Instant Image Sun SNDR SDBC Device driver NSCTL Network storage control module Secondary host User Sun STE or SV Kernel Sun StorEdge Instant Image Sun SNDR SDBC Device driver NSCTL Network storage control module Hardware Hardware IP ...

Page 17: ...change Temporary volumes such as those used in sort operations Spool files Paging volumes When selecting a volume to be used in the Sun SNDR software volume set ensure that volume does not contain disk label private areas for example slice 2 on a Solaris operating environment formatted volume The disk label region is contained in the first sectors of cylinder 0 of a disk The safest method is to en...

Page 18: ... c6t0d0s4 These raw devices should be stored on a disk separate from the disk that contains the data Configure RAID such as mirrored partitions for these bitmap devices and ensure that the mirrored members are not stored on the same disk as the data In a clustered environment a bitmap must reside only on a volume The bitmap volume in this case must be part of the same disk group or cluster resourc...

Page 19: ...dwidth allocator to restrict the bandwidth available to an application ATM Link Advantages ATM is a standards based high performance WAN protocol that establishes routes at circuit initialization Its performance combined with SONET SDH s ring healing resiliency have made it the choice of carriers in their core backbone networks ATM Quality of Service parameters allow customers to choose the circui...

Page 20: ...bit link with resiliency Link Security Solaris 8 operating environment offers IPsec the industry standard form of integrating encryption and authentication mechanisms into standard IP internetworking A Solaris 8 host can authenticate and encrypt traffic on a conversation by conversation basis Additionally Sun offers SunScreenTM software technology that permits both encryption and authentication of...

Page 21: ...e applications require that the primary and secondary sites be exactly in sync and therefore would desire that the I O not complete However many mission critical customers decide not to block local access to the data upon encountering intersite transmission errors Instead software keeps track of these writes at the primary site and then updates the recovery site when the remote service is reliably...

Page 22: ...tting it aside for recovery Telco costs might similarly dictate a deferred copy policy Some customers must timeshare narrow pipes between sites during the peak processing hours leaving only off hours for bulk intersite copies Such prospects look for incremental update capabilities to reduce the transmission load and copy time In other words they prefer to send only what has changed since the previ...

Page 23: ...In this case you might group volume sets to create a virtual large volume that preserves write operations Otherwise you might risk having inconsistent data by trying to update volume sets individually instead of as a group When an application has multiple logical volumes assigned application data integrity can be maintained by one of the following Specifying all Sun SNDR software volumes associate...

Page 24: ...copy can be used to continue operations after the user community and the applications are switched to the alternate site You should implement application level recovery procedures at the secondary site to help ensure application recovery to a well known state Recovering the Primary or Secondary Site Occasionally remote mirroring operations are interrupted either intentionally or by unplanned outag...

Page 25: ... a full volume copy The Sun SNDR software volume set data might be in question if for example there was a double disk failure on a RAID 5 set or if the Sun SNDR software is shutdown manually and writes occurred to either the primary or secondary volumes without scoreboarding being active The full copy can either be performed from the primary to the secondary or if appropriate from the secondary to...

Page 26: ... at both sites See the Instant Image documentation listed in Related Documentation on page vii When to Use The Sun StorEdge Instant Image Software at the Remote Site In most cases customers should also install Instant Image software at the secondary site to protect against a dual failure Before you resynchronize the primary site with the secondary take a point in time snapshot copy of the data If ...

Page 27: ...e Instant Image software Version 2 0 with Sun SNDR software Version 3 0 When you plan to install or upgrade to a Version 3 0 data service you must remove all Version 2 0 and 2 01 data services However the Sun StorEdge Core Services Version 3 0 Software CD contains the Sun StorEdge SUNWnvm Version 3 0 software package for those users whose systems include Version 2 0 of the Sun FWC hardware and sof...

Page 28: ...B1 A and B2 and A and B3 Note You can group one to many sets that share a common primary volume in a single I O group to operate on all sets simultaneously instead of issuing a separate command for each set See also Order Dependent Writes and Volume Set Grouping on page 13 In a multihop set the secondary host volume of one volume set can be the primary host volume of another volume set FIGURE 1 sh...

Page 29: ...un SNDR software with any enhanced network product that Sun offers Port 121 must be available for use by the Sun SNDR sndrd daemon You can use IP masquerading SNDR uses connection oriented service COTS based remote procedure calls RPC that is TCP The RPC part of the packet does not contain any address information ...

Page 30: ...20 Sun StorEdge Network Data Replicator 3 0 Configuration Guide June 2001 ...

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