HP XP P9500 Storage - Manual (Page 5)

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 CLPR Number of processor blades Total capacity of internal VOL* and
external VOL for a CLPR
7 GB or more 2 Less than 1,500 GB
15 GB or more 4
22 GB or more 6
30 GB or more 8
8 GB or more 2 1,500 GB or more
15 GB or more 4
22 GB or more 6
30 GB or more 8
16 GB or more 2 or 4 2,900 GB or more
22 GB or more 6
30 GB or more 8
22 GB or more 2, 4 or 6 11,500 GB or more
30 GB or more 8
24 GB or more 2, 4 or 6 14,400 GB or more
30 GB or more 8
30 GB or more 2, 4, 6 or 8 100,000 GB or more
32 GB or more 128,000 GB or more
40 GB or more 182,000 GB or more
48 GB or more 218,000 GB or more
56 GB or more 254,000 GB or more
64 GB or more 290,000 GB or more
72 GB or more 326,000 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