HP Storage Mirroring V5 Software - Manual (Page 71)

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‹ 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.
‹ Remirror on Auto-Reconnect —In certain circumstances, for example if the disk-based queues on the source are
exhausted, Storage Mirroring will automatically disconnect connections (called auto-disconnect) and then
automatically reconnect them (called auto-reconnect). In order to ensure data integrity on the target, Storage
Mirroring will perform an automatic mirror (called an auto-remirror) after an auto-reconnect. If you enable this
option, specify the type of auto-remirror that will be performed.
‹ File Differences with Checksum —Any file that is different on the source and target based on date, time,
and/or size is flagged as different. The mirror then performs a checksum comparison on the flagged files and
only sends those blocks that are different.
‹ File Differences with no Checksum —Any file that is different on the source and target based on date, time,
and/or size is sent to the target.
‹ Full —All files are sent to the target.
‹ Calculate Replication Set size on connection —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.
4. Click Connect to establish the connection.
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.
NOTE: Database applications may update files without changing the date, time, or file size. Therefore, if you
are using database applications, you should use the
File Differences with checksum or Full option.