HP Storage Mirroring V5.1 Software - Manual (Page 46)

4 - 8
Calculating replication set size
While Storage Mirroring is mirroring, the right pane of the Management Console displays statistics to
keep you informed of its progress. If the size of the replication set is determined before the mirror is
started, Storage Mirroring can display the percentage of the replication set that has been mirrored in
the Mirror Status column. If the size was not calculated prior to starting the mirror, the column
displays Mirroring.
1. Right-click on the replication set icon and select Properties. The Replication Set Properties
dialog box appears.
2. Select the Size tab.
3. 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.
4. Click OK to return to the Management 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. A server setting, called CalculateByVolume , is available through the
scripting language to workaround this limitation. This setting will get the amount of disk
space in use for the entire volume from the operating system, so the calculation occurs
instantaneously. However, if the entire volume is not being replicated, the mirror
percentage complete and bytes remaining will be incorrect accordingly. See the Scripting
Guide for more information on this server setting.