HP Storage Mirroring Software - Manual (Page 321)

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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.
11. Select the Mirror Properties tab and specify how you want to mirror the data.
Specify your Storage Mirroring Recover verification settings.
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Initial Verification Start—Specify when you want a verification process to be
performed. You can select the immediate date and time by clicking Now, or
enter a specific Date and Time. The down arrow next to Date displays a