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HP StorageWorks P2000 G3 MSA System SMU Reference Guide 109

1. Synchronize the secondary volume to a replication snapshot, preferably a replication sync point. Any

data written to the primary volume since the last-completed replication will not be available.

2. After synchronization, set the secondary volume to be the new primary volume.

3. Map the new primary volume to hosts, as was the original primary volume.

Figure 6 Example of primary-volume failure

If the original primary volume becomes accessible, you can set it to be the primary volume again.

1. Take a snapshot of the original primary volume. This preserves the volume's current data state for later

comparison with the new primary volume.

2. Set the original primary volume to be a secondary volume.

3. Replicate any data written to the new primary volume to the original primary volume (now a secondary

volume). This can be done as one or more replications. On the final replication, halt host access to the

primary volume to ensure that all data has been transferred to the secondary volume.

4. Set the secondary volume (the original primary volume) to be the new primary volume.

5. You can now mount the snapshot taken in step 1 and compare it with the new primary volume to

identify any data discrepancies and try to recover any data from the snapshot that would otherwise be

lost. For example, you could use host file-system tools to find any files modified since a certain time, or

for a database you could export any differing records from the snapshot and re-enter them into the

current database.

Remote replication licensing

The Remote Replication and Snapshot features are separately licensed. Remote replication can operate

without Snapshot being enabled; however, to get the most out of remote replication, it is recommended to

enable both features. Normally, replication snapshots are not accessible to hosts. However, if Snapshot is

enabled, a replication snapshot can be exported for use as a standard snapshot.

HP P2000 G3 Reference Guide

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