Recommended Cache capacity with Dynamic Provisioning or Dynamic Tiering

You have to allocate more cache capacity for each CLPR when Dynamic Provisioning or Dynamic Tiering or both applications are in use.

The following table lists the recommended cache capacity for storage systems that use Dynamic Provisioning and/or Dynamic Tiering.


Internal/external/virtual VOL for a CLPR (Total capacity)¹	Recommended cache capacity for a CLPR
Less than 4 TB	20 GB
4 TB or more	20 GB
16 TB or more	24 GB
48 TB or more	32 GB
96 TB or more	40 GB
160 TB or more	48 GB²
240 TB or more	56 GB²
360 TB or more	64 GB²
600 TB or more	72 GB²
Notes: If you are calculating the total capacity of internal/external/virtual volumes, note the following for each volume capacity: Internal volume: For RAID1, add the half of total parity group capacity. For RAID 5/6, subtract the parity disk capacity from the total parity group capacity and add that amount. External volume: Add the total capacity of the parity group. Virtual volume: Add the total capacity of LDEV. Check virtual volume LDEV capacity in Logical Device window. For details on Logical Device window, see Hitachi Virtual Storage Platform G200, G400, G600 Provisioning Guide. 40 GB for VSP G200