HP Storage Mirroring V5 Software - Manual (Page 13)

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Restoration
Restoration provides an easy method for copying replicated data from the target back to its original location on the source.
The process only requires you to select the source, target, and the appropriate replication set. There is no need to select files
or to remember where the data came from on the source since that information is maintained by Storage Mirroring.
Restoration can be used if the source data is lost due to a disk crash or when the most up-to-date data exists on the target
due to failover. At the time of a source server failure, your Storage Mirroring target will contain the same data as your Storage
Mirroring source. If you are using the Storage Mirroring failover capabilities, users can continue updating data on the target
server while the problems on the source are resolved. Because of the continued updates on the target, when the source
server is ready to come back online, the two servers will no longer contain the same data. Restoration is the process of
copying the up-to-date data from the target back to the original source or a new source.
Like mirroring, restoration has a defined end point - when all of the selected files from the target have been transmitted back
to the source. When a restoration is complete, the source and target are again synchronized.
Source Target
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All files can be restored
Checksums can calculate
blocks to be restored
Different files can
be restored
New files are restored
Identical files are
not restored
Flexible restoration options allow you to choose
while files are restored from the target to the source.