HP StorageWorks XP Remote Web Console Software - Manual (Page 67)

Zero data cannot be discarded if all the following conditions are satisfied:
•
The V-VOL status is normal.
•
The V-VOL is not associated with a pool.
•
Zero data in the V-VOL are already being discarded.
To release the pages in a V-VOL:
1. In the Remote Web Console, access the V-VOL window by selecting Go Volume Manager
V-VOL (see “Selecting the V-VOL Group” (page 61) ).
2. In the V-VOL Group - V-VOL tree in the left side of the window, select the V-VOL group
containing the V-VOLs where the pages should be released. This will display the information
about the individual V-VOLs on the right side of the window.
3. On the right side of the window, right-click one or more V-VOLs, and select Discard Zero Data
from the pop-up menu. This may take some time as the software scans the entire V-VOL looking
for pages with zero data, marking them for release when you later click Apply.
4. After selecting Discard Zero Data (and before clicking Apply), if you want to stop releasing
pages, right-click one or more V-VOLs, and select Stop Discarding Zero Data. The discarding
of zero data stops, but the already discarded zero data cannot be restored, and the pages
marked for release will be released when you click Apply.
You cannot stop releasing pages if the page status for the V-VOL is not Discarding Zero Data.
5. Click Apply, and then click OK to release pages in the V-VOL in the background.
6. After discarding zero data and releasing pages in the V-VOL is complete, click Refresh in the
Remote Web Console to update the Page Status. If the Page Status is not immediately updated,
wait awhile, and then click Refresh again.
If you have started a discard zero data operation, and the storage system loses power, which then
disrupts shared memory, the discard zero data operation will not automatically continue after the
storage system restarts.
In any of the following cases, discarding of zero data will stop and V-VOL pages will not be
released:
•
LDEV formatting was performed while discarding zero data.
•
The pool-VOL that is being accessed by the target V-VOL was blocked.
•
The pool associated with the target V-VOL was blocked while discarding zero data.
•
The pool-VOL accessed by the target V-VOL cannot be used temporarily.
•
Cache memory failure occurred while discarding zero data.
•
The association between the target V-VOL and the pool was released when zero data was
discarded.
•
An attempt was made to perform XP Continuous Access or XP Continuous Access Journal initial
copy operations on the V-VOL when zero data was discarded from the V-VOL.
Changing the V-VOL Settings of Multiple V-VOL Groups
You can change information about V-VOLs in multiple V-VOL groups, such as the pool association
and the threshold.
Associating Multiple V-VOL Groups with a Pool
You can associate multiple V-VOL groups with a pool. The time required to associate changes
between V-VOLs in multiple V-VOL groups with a pool can vary greatly depending on the V-VOL
capacity and the quantity of V-VOLs being associated.
To associate multiple V-VOL groups with a pool:
Managing V-VOLs and V-VOL Groups 67