About pool-vols, Pool status, About pool-vols pool status – HP XP P9500 Storage User Manual
Page 97
The total pool capacity combines the capacity of all the registered pool-VOLs assigned to the pool.
Pool capacity is calculated using the following formulas:
•
capacity of the pool
(MB) = total number of pages × 42 - (4116 + 336)
•
total number of pages
= Σ(floor(floor(pool-VOL number of blocks ч 512) ч
168)) for each pool-VOL
where
•
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.
When adding a volume to the pool for which Smart Pool is enabled, note the following:
•
Up to three types of drive type/RPM are allowed between all the pool-VOLs to be added.
•
Volumes to be added to the same pool must have the same RAID level across all the same
drive type/RPM pool-VOLs.
For example, you cannot add a volume whose drive type/RPM is SAS/15k and whose RAID
level is 5 (3D+1P) when a volume drive type/RPM is also SAS/15k but whose RAID level is
5 (7D+1P) is already in the pool.
•
The top pool-VOL cannot be deleted from a pool. The drive type/RPM and RAID level are
fixed, and the tier will not be able to be deleted from the pool.
If you increase the pool capacity by adding a pool-VOL, a portion of the existing data in the pool
automatically migrates from an older pool-VOL to the newly added pool-VOL, balancing the usage
levels of all the pool-VOLs. If you do not want to automate balancing of the usage levels of
pool-VOLs, call the HP Technical Support for assistance.
Thin Provisioning does not automatically balance the usage levels among pool-VOLs if the cache
memory is not redundant or if the pool usage level is more than the pool thresholds.
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
for SIM code details.
Working with pools
97