HP XP7 Provisioning for Open Systems User Guide (H6F56-96009)

Causes and SolutionsProblems
Causes:
• Zero pages in the THP V-VOL cannot be reclaimed because the THP
V-VOL does not meet conditions for releasing pages in a THP V-VOL.
Solutions:
• Make sure that the THP V-VOL meets the conditions described in
“Releasing pages in a THP V-VOL” (page 153).
Cannot reclaim zero pages in a THP V-VOL.
Causes:
• Pages of the THP V-VOL are not released because the process of
reclaiming zero pages was interrupted.
Solutions:
• Make sure that the THP V-VOL meets the conditions described in
“Releasing pages in a THP V-VOL” (page 153).
The THP V-VOL cannot be released if the
process to reclaim zero pages in the THP
V-VOL is interrupted.
Causes:Cannot release the Protection attribute of the
THP V-VOLs.
• The pool is full.
• The pool-VOL is blocked.
• The pool-VOL that is an external volume is blocked.
Solutions:
• Add pool-VOLs to the pool to increase the free space in the pool.
See “Increasing pool capacity” (page 144).
• Perform the reclaiming zero pages operation to release pages in
which zero data are stored. See “Releasing pages in a THP V-VOL”
(page 153).
• Contact HP Technical Support to restore the pool-VOL.
• If the blocked pool-VOL is an external volume, verify the status of the
path blockade and the external storage system.
• After performing above solutions, release the Protection attribute
(Data Retention) of the THP V-VOLs. For information about Data
Retention, see HP XP7 Provisioning for Open Systems User Guide.
Causes:
• Pool usage level exceeds the threshold.
Solutions:
SIM code such as 620XXX, 625000 or
626XXX was issued.
• Add pool-VOLs to the pool to increase the free space in the pool.
See “Increasing pool capacity” (page 144).
• Perform the operation to reclaim zero pages in order to release pages
in which zero data are stored. See “About releasing pages in a THP
V-VOL” (page 152).
Causes:
• Usage of the pool has reached 100%.
Solutions:
SIM code 622XXX was issued.
• Add pool-VOLs to the pool to increase the free space in the pool.
See “Increasing pool capacity” (page 144).
• Perform the operation to reclaim zero pages in order to release pages
in which zero data are stored. See “About releasing pages in a THP
V-VOL” (page 152).
Troubleshooting Thin Provisioning 205