Zero page release in a V-VOL

Provisioning Guide for VSP One Block

Version
10.2.x
Audience
anonymous
Part Number
MK-23VSP1B012-00

You can reclaim pages in a V-VOL to free pool capacity. If a page assigned to a V-VOL contains only zero binary data, you can reclaim the page by releasing zero pages. Reclaiming the page decreases the used capacity of the pool. 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.

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

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 these cases, the reclaiming zero pages will stop, and V-VOL pages will not be released:

  • LDEV formatting was performed while reclaiming zero pages.
  • 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 reclaiming zero pages.
  • Cache memory failure occurred while reclaiming zero pages.
  • The V-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 V-VOL in which zero pages were being reclaimed.