HP Storage Mirroring Software - Manual (Page 353)

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Full Mirror—All files in the replication set will be sent from the source
to the target.
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File differences—Only those files that are different based size or date
and time will be sent from the source to the target.
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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.
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.
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Use block checksum—For those files flagged as different, the mirror
performs a checksum comparison and only sends those blocks that are
different.
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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.
i. Click Finish to complete the creation of the Double-Take Source Connection
resource.
Establishing your connection on Windows 2008
a. From the Failover Cluster Management applet, right-click on the group and