Releasing Pages In A Thp V-Vol - HP XP7 User Manual

If all the tracks that belong to a page assigned to a THP V-VOL have no records written, you can
reclaim the page and return it to the pool's available capacity.
CAUTION:
pages might be not released.
The pool-VOL accessed by the target THP V-VOL is blocked.
The pool associated with the target THP V-VOL is blocked while the operation to reclaim zero
pages is in progress.
Cache memory failure occurs while the operation to reclaim zero pages is in progress.
While the operation to reclaim zero pages is in progress, the initial copy operation of the
Continuous Access Synchronous Z pair, or the Continuous Access Journal Z pair is performed
on the THP V-VOL.

Releasing pages in a THP V-VOL

You can reclaim pages in a THP V-VOL to free pool capacity. If a page assigned to a THP V-VOL
contains only zero binary data, you can reclaim the page by performing the operation to release
zero pages. Reclaiming the page decreases the used capacity of the pool.
Before releasing pages in a THP V-VOL, see
If the operation to release zero pages is performed on V-VOLs enabled for full allocation, the used
capacity of the pool is not changed before the operation to release zero pages is performed.
Prerequisites
The Storage Administrator (Provisioning) role is required to perform this task.
Procedure
1. Open the LDEVs window.
In Command View Advanced Edition:
a. On the Resources tab, click Storage Systems, and then expand All Storage Systems.
b. Expand the target storage system, right-click Volumes, and then select System GUI.
In Remote Web Console:
a. Expand the Storage Systems tree.
b. Click Logical Devices.
2. From the table, select the LDEV ID of the volume with the pages you want to release.
3. Click More Actions, and then select Reclaim Zero Pages.
The Reclaim Zero Pages window opens.
You cannot release pages in a THP V-VOL when the THP V-VOL is not in a normal status or
the THP V-VOL is in the process of reclaiming zero pages.
4. Click Finish.
The Confirm window appears.
5. In the Task Name text box, type a unique name for the task or accept the default.
You can enter up to 32 ASCII characters and symbols, with the exception of: \ / : , ; * ? "
< > |. The value "date-window name" is entered by default.
6. Click Apply.
If the Go to tasks window for status check box is selected, the Tasks window appears.
After the operation to reclaim zero pages is complete, refresh the display to update the Page Status.
If the Page Status is not immediately updated, wait a while, then refresh the display again.
154 Configuring thin provisioning
In the following cases, an operation of the reclaim zero pages stops and THP V-VOL
"About releasing pages in a THP V-VOL" (page 153)).