HP StorageWorks Storage Mirroring for Linux User's Guide (T2558-96078, February 2008)

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12 X Restoration
Restoration
The Storage Mirroring restoration process 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 machine failure, your Storage Mirroring target will contain the same data as your
Storage Mirroring source. If you are using Storage Mirroring’s failover capabilities, users can continue updating data on the
target machine while the problems on the source are resolved. Because of the continued updates on the target, when the
source machine is ready to come back online, the two machines 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 location when bringing the source back
online.
Do not let users access the source or target machines during the restoration process. The restoration process is similar to
the original connection process, except that only mirroring is activated. Therefore, the data must not be changing on the target
during the restore. Changes made to files on the target during the restore will not be transmitted back to the source.
Additionally, files that are in use on the source may prevent the restore from updating those files.