HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

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4. If the replication set size has never been determined, click Calculate. If the
replication set has previously been determined, the button will be labeled
Recalculate. Depending on user activity, the size shown may not accurately reflect
the current size of the replication set. If changes are occurring to files in the
replication set while the calculation is being made, the actual size may differ
slightly. The amount of data is determined at the exact time the calculation is
made.
5. Click OK to return to the Replication Console.
Note:
You can also configure the replication set calculation when establishing a
connection through the Connection Manager by selecting Calculate
Replication Set size on connection on the Mirroring tab.
If your replication set contains a large number of files, for example, ten
thousand or more, you may want to disable the calculation of the
replication set size so that data will start being mirrored sooner. If
calculation is enabled, the source calculates the file size before it starts
mirroring. This can take a significant amount of time depending on the
number of files and system performance. Disabling calculation will result
in the mirror status not showing the percentage complete or the number of
bytes remaining to be mirrored.