HP P9000 Provisioning for Mainframe Systems User Guide (AV400-96369, October 2011)

Working with pools
About pools
Thin Provisioning Z requires the use of pools. A pool consists of more than one pool-VOL. A storage
system supports up to 128 pools, each of which can contain up to 1024 pool-VOLs and 65,232
THP V-VOLs per pool.
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
• total number of pages = Σ(floor(floor(pool-VOL number of blocks ÷ 116) ÷
672)) for each pool-VOL
• floor( ) means to truncate the part of the formula within the parentheses after the decimal point.
• 1 cylinder - 1740 blocks
About pool-VOLs
Pool-VOLs are grouped together to create a pool.
When creating a new pool, available pool-VOLs are selected in the Select Pool VOLs window and
added to the Selected Pool Volumes table. After adding one or more pool-VOLs, one pool-VOL
must be designated as the top pool-VOL. Every pool must have a top pool-VOL because it is used
to store system information. After selecting and designating a pool-VOL as the top pool-VOL, it will
appear on the first row of the Selected Pool Volumes table. This is significant because the top
pool-VOL cannot be removed from the pool without deleting the pool. When the pool is expanded,
the top pool-VOL will not change.
To change an unregistered pool-VOL to the top pool-VOL in the Selected Pool Volumes table, select
the pool-VOL and then click Change Top Pool Vol. After registering, the top pool-VOL cannot be
changed.
During initial creation of a pool, designate a pool-VOL as the top pool-VOL, select the pool-VOL,
and click Change Top Pool VOL in the selected pool volumes table. After registering, the top
pool-VOL cannot be changed.
The pool-VOLs contained in a pool can be added or deleted, except the top pool-VOL can never
be 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 that appears in Remote Web Console. The status
indicates that a SIM code may have been issued that needs to be resolved. See “SIM reference
codes” (page 60)for SIM code details.
The THP V-VOL status remains normal even though the pool status may be something other than
normal.
SIM code*ExplanationStatus
Not applicableNormal status.Normal
If the pool-VOL is blocked, SIM code 627XXX
is reported.
The pool-VOL in the pool is blocked or the pool is
being shrunk.
Warning
620XXX, or 626XXX, or 626000The pool usage level may exceed the pool
threshold.
Exceeded
Threshold
Working with pools 53