Applies To:

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Storage Platform(s) – Dell PowerVault MD3600F MD3620F,MD3660F

Author:

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Manjunatha Reddy MC

Problem:

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How do I configure Synchronous Write Mode Legacy Remote Replication between PowerVault Primary and Secondary Storage Array?

Solution:

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Synchronous write mode removes the restriction that the remote write has to complete along with the local primary write but this mode does not guarantee that data was successfully written to the secondary virtual disk before indicating a successful write to the host system.  This mode accepts writes to the primary virtual disk if the secondary virtual disk is unavailable and the performance of the primary-side application is not gated by communication link performance.

The prerequisites for asynchronous write mode legacy remote replication are

  • The legacy remote replication premium feature must be enabled and activated on the local and remote storage array.
  • The local and remote storage arrays must be connected through a proper fibre channel fabric interface.
  • Test the communication link between the primary and secondary storage array.
  • Create a virtual disk in the secondary storage array that is greater than or equal to the capacity of     the primary virtual disk to be in the replicated pair.
  • Create a replicated virtual disk pair between the primary virtual disk and secondary virtual disk and then create the replication relationship between the two virtual disks.

Enable and Activate Legacy Remote Replication

To enable the legacy remote replication, obtain the legacy remote replication keys from the customer support and apply the saved key file.

To activate legacy remote replication, navigate to the Copy Services tab in Array Management and select Remote Replication and then select Activate.

 

In the Select Replication Feature window select Remote Replication (Legacy) and then click Next.

In the Create Repositories (Activate Replication) window select Free capacity on the existing disk pool or disk group then select the disk pool name and then click Finish to create two repository virtual disks for legacy replication.

Create Replicated Pair

In the PowerVault MD Storage Manager (Array Management) click Copy Services and select Remote
Replication
and Remote Replication Legacy and select Create Replicated Pair to create the remote replicated pair for legacy remote replication.

In the Create Remote Replication (Legacy) Introduction window click Next

In the Select Secondary Virtual Disk window of Create Remote Replication (legacy) select the virtual disk name which has to be part of the replicated pair and then Click Next

In the Select Storage Array window select the remote storage array and then click Next

In the Select Synchronization Settings window select resynchronization method as Automatic resynchronization and then click Next

In the Set Write Mode window select Synchronous write mode and then click Next

In the Preview (Create Remote Replication (Legacy)) window Type yes to confirm the remote replication
legacy creation