Home > Storage > CLARiiON Storage Replication with Recover Point

CLARiiON Storage Replication with Recover Point

One of the main aspects of any Disaster Recovery strategy has to be Storage Replication considering all critical applications & data are generally hosted on a highly available SAN Infrastructure. With growing influence of Virtualization on Data Center , Number of  Servers that are virtualized has been increasing and will continue to grow and replicating these VM’s is also critical. VMware provides SRM ( Site Recovery Manager ) as a DR solution for VMware VM’s in conjunction with Array Replication Technologies.Integration of Storage Replication technology with Products like VMware SRM which provides Disaster Recovery solutions for Virtual Machine’s would go a long way in automating the DR process.

Replication can be local or remote and also can be synchronous or Asynchronous.  Based on various tests that we carried out for both local and remote replication ,  Recover Point seems to be a better solution and in this post I would try and share my thoughts on the same.

There are 3 EMC Replication technologies that can be utilized for replication of data that is available on a CLARiiON array and they are :

  • Snap View
  • Mirror View
  • Recover Point
Below snapshot from EMC RecoverPoint/SE Applied technology white paper shows the differences between various Storage Replication technologies of EMC :
There are two editions of Recover Point –
  • RecoverPoint/SE – CLARiiON Specific
  • Recover Point  – Can be used across heterogeneous Storage
Below snapshot shows the differences  between Recover Point & RecoverPoint/SE from EMC RecoverPoint/SE Applied technology white paper
Why is Recover point a better Storage Replication Technology ?
  • Support for federated database / federated OS / federated Storage Systems. RPA can be used across all LUNs from different Storage vendors like EMC , HP , IBM etc. ..
  • Quick & Guaranteed Recovery even in case of a rolling disaster to a point in time copy from the journal
  • Huge bandwidth savings as a result of de-dupe and compression.
  • Application aware solution with agents available for Exchange / SQL / Hyper-V and VMware SRM ( Automatic Failover and failback)
  • Supports and recognizes Thin provisioning. Thick LUN can be resynced to a thin LUN in the remote site.
  • Recover Point can do Synchronous Replication locally and at the same time do a Asynchronous replication with the remote storage system.
  • Enable Read / Write Access to the Remote Replica Volume w/o requiring Clone or Snapshot ( Mirror View requires Clone/Snap of Remote LUN to be presented to host for verification). Changes upto 40GB or 20% of journal Size is permitted.
  • Usage of Write splitters at CLARiiON end and Host End . Duplicates any incoming writes and send it across to RPA appliance for immediate journaling. With splitters we can replicate LUNS of upto 32 TB and w/o splitters maximum supported LUN size is 2 TB.
  • Independent Recovery ( In spite of doing a simultaneous local replication and remote Asynchronous replication )
  • Replicates small aperture of snaps frequently and this would help us in reducing data lag
  • RPA Supports almost all existing CLARiiON Arrays whereas Mirror View would require iSCSI ports on CLARiiON array.
  • With EMC Cluster Enabler for RPA , we can have geographically dispersed MS cluster that is supported
VMware SRM & Recover point Integration means Administrators can run mock DR drills tests right from SRM console without the need to change settings in Recovery Point console and that’s Cool !
Categories: Storage Tags: , ,
  1. raj
    August 15, 2011 at 10:54 pm

    Hi Sudarsan, I am a Storage ops specialist and we are planning to set up recoverpoint as a DR solution in our clariion environment. Have you implemented RecoverPoint in ur environment. If so, do you have any detailed documentation how to implement RP with CLARiiONs in the environment.

  2. August 17, 2011 at 5:27 am

    Yes we have implemented RPA and the above post is a analysis that we had done. Powerlink has RPA Administrator Guide which Covers all aspects of RPA from Concepts to Installation & Troubleshooting.

  3. Daniel Kepplinger
    August 19, 2011 at 8:00 pm

    I know that you can mirror a thick lun to a thin lun, but what I want to know is if it is possible to mirror a thin lun to a thick lun. I understand that this sounds odd, but you actually end up with more target space if you use Raid Groups on the Target. The VNX does not support thin luns in Raid Groups (ie; only in Pools). Pools are innefficient because you must maintain 30% free.

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