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
- RecoverPoint/SE – CLARiiON Specific
- Recover Point - Can be used across heterogeneous Storage
- 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