HP StorageWorks Storage Mirroring for Linux User's Guide (T2558-96317, June 2009)

6 - 3
 Use checksum comparison to send minimal blocks of data—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.
 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.
 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: See the table File Differences Mirror Options Compared on page 10-2 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.
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.