HP XP7 Storage - Manual (Page 113)

A pool number must be assigned to a pool. Multiple THP V-VOLs can be related to one pool.
•
capacity of the pool (MB) = total number of pages * 38 - 3800
3800 in the formula is the management area size of the pool-VOL with System Area.
•
total number of pages = Σ(floor(floor(pool-VOL number of blocks ч 116) ч
672)) for each pool-VOL
•
1 cylinder - 1740 blocks
•
floor( ) means to truncate the part of the formula within the parentheses after the decimal point.
About pool-VOLs
Pool-VOLs are grouped together to create a pool. When a new pool is created, the available
pool-VOLs are selected in the Select Pool VOLs window and added to the Selected Pool Volumes
table. Every pool must have a pool-VOL with System Area.
During initial creation of a pool, designate a pool-VOL as the pool-VOL with System Area, select
the pool-VOL, and click Change Top Pool VOL in the selected pool volumes table.
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 131) 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
Z.
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, 3.8 GB are used as the management area in the pool-VOL
with system area.
Working with pools 113