HP XP7 Storage - Manual (Page 55)

Requirements Items
Total Number of pages =
Σ(floor(floor(pool-VOL number of blocks ч
116) ч 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 11.1 PB if shared memory is installed.
From 1 to 1,024 volumes (per pool). Max number of
pool-VOLs
A volume can be registered as a pool-VOL to one pool only.
Up to a total of 128 pools per storage system. This is the total number of pools, Thin Provisioning
Z (including Smart Tiers Z) pools, and Fast Snap pools. Maximum number of
pools
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. Increasing capacity
You can reduce pool capacity by removing pool-VOLs. Reducing capacity
You can delete pools that are not associated with any THP V-VOLs. Deleting
From 0 to 65534 (%). Subscription limit
If you do not specify a value, the subscription is set to unlimited.
Thresholds •
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 Data allocation unit
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. Tier
(Smart Tiers Z)
927 TB (Total capacity of the tiers must be within 927 TB Maximum capacity
of each tier
(Smart Tiers Z)
Pool-VOL requirements
Pool-VOLs make up a THP-pool.
Requirements Items
Logical volume (LDEV) Volume type
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.
Pool-VOLs cannot be used for any other purpose. For instance, you cannot specify the following
volumes as Thin Provisioning Z and Smart Tiers Z pool-VOLs:
• Volumes used by Business Copy Z, Continuous Access Synchronous Z, or Continuous Access
Journal Z
•
Volumes defined by Cache Residency
• Volumes already registered in Thin Provisioning Z or Smart Tiers Z pools
Thin provisioning requirements 55