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New Post: Part 3 – Configuring Site Recovery Manager (SRM) With HP StoreVirtual VSA

Discussion in 'VMware Certifications' started by craigie, Oct 28, 2012.

  1. craigie

    craigie Terabyte Poster

    This is where things start to get exciting! We are going to replicate Volumes between Production and DR and then check to ensure that SRM can see the replicated Volumes.

    Replication can occur on two different levels, ‘synchronously’ and ‘a synchronously’ naturally it is only used for write’s and not read’s, so what’s the difference?

    Synchronous written blocks are sent to the replication SAN, until this is committed by the replication SAN and confirmation received by the replication SAN, no further block’s are allowed to be written by either SAN. This means that you would have potentially one block of data loss in the event of a SAN failure. This type of replication should only be used in low latency environments, and is the basis for network RAID on the HP StoreVirtual VSA. As a general rule of thumb the latency normal needs to be less than <2ms to achieve this.

    A Synchronous written blocks are sent to the replication SAN and no confirmation is required. The originating SAN just keeps sending more and more blocks on a predefined schedule e.g. 30 minutes. If you have a SAN failure than your potential data loss is up to last block that the replication SAN had chance to commit. This is the most commonly used replication type and is supported with the HP StoreVirtual VSA and SRM.

    Replicating Volumes

    In my lab, I have created two volumes at the Production site called PR_SATA_TEST01 and PR_SATA_TEST02 these are thinly provisioned and contain the VMDK files for VMF-TEST01 AND VMF-TEST02 respectively.

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    Certifications: CCA | CCENT | CCNA | CCNA:S | HP APC | HP ASE | ITILv3 | MCP | MCDST | MCITP: EA | MCTS:Vista | MCTS:Exch '07 | MCSA 2003 | MCSA:M 2003 | MCSA 2008 | MCSE | VCP5-DT | VCP4-DCV | VCP5-DCV | VCAP5-DCA | VCAP5-DCD | VMTSP | VTSP 4 | VTSP 5
  2. onoski

    onoski Terabyte Poster

    Interesting stuff Cragie and thanks for sharing as we use SRM at work using the Sychronous option, A Sychronous remains me of the UDP protocol:)
    Certifications: MCSE: 2003, MCSA: 2003 Messaging, MCP, HNC BIT, ITIL Fdn V3, SDI Fdn, VCP 4 & VCP 5
    WIP: MCTS:70-236, PowerShell

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