HP StorageWorks Storage Mirroring user's guide (T2558-96073, February 2008)

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 Start—If you select to start a mirror, you will need to make the following two selections on the Start Mirror dialog box.
 Full Mirror—All files in the replication set will be sent from the source to the target.
 File Differences—Only those files that are different based on date, time, and/or size will be sent from the source to
the target.
 Send data only if Source is newer than Target—Only those files that are newer on the source are sent to the
target.
 Use block checksum—For those files flagged as different, the mirror performs a checksum comparison and
only sends those blocks that are different.
 Calculate Replication Set size prior to mirror—Determines the size of the replication set prior to starting the
mirror. The mirroring status will update the percentage complete if the replication set size is calculated.
 Stop—When stopping a mirror, Storage Mirroring stops queuing mirror data on the source and does not maintain a
pointer to determine what information still needs to be mirrored to the target. Therefore, when starting a mirror that
has been stopped, the process will mirror all of the data contained in the replication set.
 Pause or Resume—When pausing a mirror, Storage Mirroring stops queuing mirror data on the source but maintains a
pointer to determine what information still needs to be mirrored to the target. Therefore, when resuming a paused
mirror, the process continues where it left off.
NOTE: If you are using a database application, do not use the newer option unless you know for certain
you need it. With database applications, it is critical that all files, not just some of them that might
be newer, get mirrored.