Cache capacity
The recommended amount of cache to install is determined by the RAID
level, the number of drives installed in the system, and whether Hitachi
Dynamic Provisioning (HDP), Hitachi Dynamic Tiering (HDT), Dynamic Cache
Residency (DCR), and Universal Volume Manager (UVM) are applied or not.
The recommended data cache capacity per Cache Logical Partition (CLPR) =
(CLPR capacity) - (DCR Extent setting capacity per CLPR). When CLPR is not
applied to DP/DT/DCR, install the recommended data cache capacity shown
in the following table.
To configure a system for maximum performance, please contact your
authorized Hitachi Data Systems representative. See
Getting Help
in the
preface of this manual.
Table 12 Recommended data cache capacity when DP, DT, DCR, and UVM
are not being used
Total logical capacity of external v
internal volumes per CLPR
Recommended data cache capacity per CLPR
Less than 2,900 GB
15 GB or more
less than 2,900 GB
15 GB or more
2,900 GB or more
16 GB or more
11,500 GB or more
22 GB or more
14,400 GB or more
24 GB or more
100,000 GB or more
30 GB or more
128,000 GB or more
32 GB or more
182,000 GB or more
40 GB or more
218,000 GB or more
48 GB or more
254,000 GB or more
56 GB or more
290,000 GB or more
64 GB or more
326,000 GB or more
72 GB or more
Shared memory
Shared memory holds storage system configuration information and it resides
in the cache. The capacity of the shared the capacity of the cache
memory = the total capacity of the cache memory needed by the storage
system.
The capacity overheads associated with the capacity saving function
(deduplication and compression) include capacity consumed by metadata and
capacity consumed by garbage (invalid) data. For more information, see the
Provisioning Guide for Open Systems
. The recommendation is to use 0.2% of
active data size as cache size (200 GB of cache for every 100 TB of pool
capacity to be reduced).
Introduction
45
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
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