HP XP Racks - Manual (Page 123)

Thin Provisioning does not automatically balance the usage levels among pool-VOLs if the cache
memory is not redundant or if the pool usage reaches up to the threshold.
The pool-VOLs contained in a pool can be added or deleted. Removing a pool-VOL does not delete
the pool or any related THP V-VOLs. You must delete all THP V-VOLs related to the pool before the
pool can be deleted. When the pool is deleted, all data in the pool is also deleted.
Pool status
The following table describes the pool status. The status indicates that a SIM code may have been
issued that needs to be resolved. See
“SIM reference codes” (page 141) for SIM code details.
The THP V-VOL status remains normal even though the pool status may be something other than
normal.
SIM code* Explanation Status
None Normal status. Normal
If the pool-VOL is blocked, SIM code 627XXX
is reported. A pool-VOL in the pool is blocked. Warning
620XXX or 626XXX The pool usage level may exceed a pool threshold. Exceeded
Threshold
None The pools is being shrunk and the pool-VOLs are
being deleted. Shrinking
622XXX or 623XXX The pool is full or an error occurred in the pool,
therefore the pool is blocked. Blocked
*XXX in the SIM code indicates the hexadecimal pool number.
Creating a pool
The following procedure tells how to create a pool. This procedure is for setting up Thin Provisioning,
but optional steps are shown for setting up Smart TiersSmart Tiers Z if you chose to add tiers to
your storage system.
Before creating a pool, you must install the proper amount of shared memory, and you must have
a V-VOL management area in shared memory. When shared memory is added, the V-VOL
management area is automatically created. To add shared memory, contact your HP representative.
One pool-VOL with system area is defined for a pool. The priorty of the pool-VOL with system area
is assigned according to the data drive type. The available capacity of the pool-VOL with system
area is deducted from the management area capacity. The management area capacity stores the
management information of program products that use the pool. If Thin Provisioning, Smart Tiers,
or Fast Snap is used on an open system, 4.2 GB are used as the management area in the pool-VOL
with system area.
When the pool is created, a pool-VOL with system area is assigned the priority shown in the
following table.
Data drive type Priority
SAS7.2K 1
SAS10K 2
SAS15K 3
SSD 4
External volume 5
Working with pools 123