Releasing pages in a DP-VOL

You can reclaim pages in a DP-VOL to free pool capacity. If a page assigned to a DP-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 DP-VOL, see About releasing pages in a DP-VOL. 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.

Before you begin

The Storage Administrator (Provisioning) role is required to perform this task.

Procedure

  1. Click Storage Systems, and then expand the Storage Systems tree.

  2. Click Pools.

  3. From the table, select the LDEV ID of the volume with the pages you want to release.

  4. Click More Actions, and then select Reclaim Zero Pages.

    The Reclaim Zero Pages window opens.

    You cannot release pages in a DP-VOL when the DP-VOL is not in a normal status or the DP-VOL is in the process of reclaiming zero pages.

  5. Click Finish.

    The Confirm window appears.

  6. 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.

  7. 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.
    NoteCompleted is displayed as the Page Status even when no pages can be reclaimed.

    If you have started the reclaiming zero pages operation, and the storage system is powered off the reclaiming zero pages operation will not automatically continue after the storage system restarts.

    In any of the following cases, the reclaiming zero pages will stop, and DP-VOL pages will not be released:

    • LDEV formatting was performed while reclaiming zero pages.
    • The pool-VOL that is being accessed by the target DP-VOL was blocked.
    • The pool associated with the target DP-VOL was blocked while reclaiming zero pages.

    • Cache memory failure occurred while reclaiming zero pages.

    • The DP-VOL was deleted when zero pages were reclaimed.
    • The initial copy operation between the TrueCopy pair or the Universal Replicator pair was performed on the DP-VOL in which zero pages were being reclaimed.
Parent Topic
  • About releasing pages in a DP-VOL

    Releasing pages in a DP-VOL frees up pool capacity. When a page in the DP-VOL contains zero data, the free capacity of a pool increases after the pages are released. You can reclaim zero pages on each V-VOL and then monitor the progress on the View Pool Management Status window. If you stop the reclaim zero pages operation, the zero pages that have already been reclaimed cannot be restored.