HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

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Core operations
Storage Mirroring Recover performs four basic types of operations.
● Mirroring—The initial copy or subsequent resynchronization of selected data
● Replication—The on-going capture of byte-level file changes
● Failure monitoring and failover—The ability to monitor and stand-in for a server,
in the event of a failure
● Restoration—A mirror of selected data from the target back to the source
Mirroring
Mirroring is the process of transmitting user-specified data from the source to the target
so that an identical copy of data exists on the target. When Storage Mirroring Recover
initially performs mirroring, it copies all of the selected data, including file attributes and
permissions. Mirroring creates a foundation upon which Storage Mirroring Recover can
efficiently update the target server by replicating only file changes.
If subsequent mirroring operations are necessary, Storage Mirroring Recover can mirror
specific files or blocks of changed data within files. By mirroring only files that have
changed, network administrators can expedite the mirroring of data on the source and
target servers.
Mirroring has a defined end point - when all of the selected files from the source have
been transmitted to the target. When a mirror is complete, the target contains a copy of
the source files at that point in time.