HP Storage Mirroring V5.1 Software - Manual (Page 51)

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3. If desired, you can configure mirror settings before establishing your connection. Select the
Mirroring tab on the Connection Manager.

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.

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.
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: See the table File Differences Mirror Options Compared on page 11-2 for a
comparison of how the file difference mirror settings work together, as well as how
they work with the global checksum setting on the Source tab of the Server
Properties.