HP Storage Mirroring Software - Manual (Page 149)

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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.
l
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: The settings on the other tabs of the Connection Manager are advanced
settings. You can modify any of them before or after establishing your
connection.
If you decide to enable orphan file processing while you are establishing
your connection, orphan files will not be immediately processed when you
create the connection. This setting is for processes that are run after a
connection is already established (remirror, auto-remirror, verification, and
so on).