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HP XP P9000 Cache Partition User Guide (AV400-96477, August 2012)

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on the storage system, and whether Thin Provisioning, Smart Tiers, Cache Residency, Compatible
XRC, or External Storage is used or not (enabled or disabled).
Calculate the recommended cache capacity for a CLPR using the formula below:
Recommended cache capacity (GB) for a CLPR = (CLPR capacity (GB) – ceiling (Cache Residency
extents (MB)/ 2,048) × 2 GB)
(i) When Thin Provisioning, Smart Tiers, Cache Residency or Compatible XRC
is not used:
When you do not use any of Thin Provisioning, Smart Tiers, Cache Residency, or Compatible XRC
for a CLPR, see the table below for the recommended cache capacity.
Recommended cache capacity for a CLPRNumber of processor bladesTotal capacity of internal VOL* and
external VOL for a CLPR
7 GB or more2Less than 1,500 GB
15 GB or more4
22 GB or more6
30 GB or more8
8 GB or more21,500 GB or more
15 GB or more4
22 GB or more6
30 GB or more8
16 GB or more2 or 42,900 GB or more
22 GB or more6
30 GB or more8
22 GB or more2, 4 or 611,500 GB or more
30 GB or more8
24 GB or more2, 4 or 614,400 GB or more
30 GB or more8
30 GB or more2, 4, 6 or 8100,000 GB or more
32 GB or more128,000 GB or more
40 GB or more182,000 GB or more
48 GB or more218,000 GB or more
56 GB or more254,000 GB or more
64 GB or more290,000 GB or more
72 GB or more326,000 GB or more
* Calculate the internal volume capacity for a CLPR using the formula below.
Internal volume capacity = number of (3D+1P) parity groups x capacity of one HDD x 3 + number of (6D+2P) parity
groups x capacity of one HDD x 6 + number of (7D+1P) parity groups x capacity of one HDD x 7 + number of
(14D+2P) parity groups x capacity of one HDD x 14 + number of (2D+2D) parity groups x capacity of one HDD x 2
When you use an external volume or a virtual volume, you cannot use the above formula. If you
use an external volume, calculate the total capacity of parity groups that are associated with the
CLPR. If you use a virtual volume, calculate the total LDEV capacity of the virtual volume that is
Cache capacity for a CLPR 5