Pool-Vol Requirements - HP XP7 User Manual

Items
Max number of
pool-VOLs
Maximum number of
pools
Increasing capacity
Reducing capacity
Deleting
Subscription limit
Thresholds
Data allocation unit
Tier
(Smart Tiers Z)
Maximum capacity
of each tier
(Smart Tiers Z)

Pool-VOL requirements

Pool-VOLs make up a THP-pool.
Items
Volume type
60 Configuring thin provisioning
Requirements
The 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 ÷
116) ÷ 672)) for each pool-VOL.
floor( ): Truncates the value calculated from the formula in parentheses after the decimal point.
However, the upper limit of total capacity of all pools is 1 1.1 PB if shared memory is installed.
From 1 to 1,024 volumes (per pool).
A volume can be registered as a pool-VOL to one pool only.
Up to a total of 128 pools per storage system. The 128 pools include following pool types:
Thin Provisioning (including Smart Tiers)
Thin Provisioning Z (including Smart Tiers Z)
Fast Snap
Pool IDs (0 to 127) are assigned as pool identifiers.
You can increase pool capacity dynamically. Increasing capacity by one or more parity groups
is recommended by adding pool-VOLs.
You can reduce pool capacity by removing pool-VOLs.
You can delete pools that are not associated with any THP V-VOLs.
From 0 to 65534 (%).
If you do not specify a value, the subscription is set to unlimited.
Warning Threshold: You can set the value between 1% and 100%, in 1% increments. The
default is 70%.
Depletion Threshold: You can set the value between the warning threshold and 100%, in
1% increments. The default is 80%.
38 MB
The 38-MB page corresponds to a 38-MB continuous area of the THP V-VOL. Pages are allocated
for the pool only when data has been written to the area of the THP V-VOL.
Defined based on the media type. Maximum 3 tiers.
927 TB (Total capacity of the tiers must be within 927 TB
Requirements
Logical volume (LDEV)
While pool-VOLs can coexist with other volumes in the same parity group, for best performance:
pool-VOLs for a pool should not share a parity group with other volumes.
pool-VOLs should not be located on concatenated parity groups.