To view detailed information about the sub-volume(s) of the selected storage group
On the Navigation Tree, click Report Warehouse, then click Storage and select Storage Groups.
Click the name of the storage group that contains the sub-volume or click anywhere on its row, and then click 
.
Select the Sub-Volumes Information tab at the top of the page.
The Volume Information window provides the following information:
State: Displays the current status of the sub-volume, e.g., whether it is active or closed.
NOTE: It is not possible to archive data to closed sub-volumes.
Number of files: Displays the number of files in a sub-volume.
First Copy volume: Displays the name(s) of a First Copy volume(s).
Size on first copy: Displays the size (in bytes) of data stored in a First Copy volume.
Second copy volume: Displays the name(s) of a Second Copy volume(s).
Size on second copy: Displays the size (in bytes) of the data stored in a Second Copy volume.
Promote: Click to promote the sub-volume. A dialog box appears. Click OK to promote the sub-volume. Note: When you promote a sub-volume, you close it. Data cannot be added to closed sub-volumes.
Cancel: Click to cancel the promotion.