Cache Flash Memory Capacity - Hitachi Virtual Storage Platform G1000 Hardware Manual

disk is written to the cache, it is written to one blade of the CPA and mirrored
to the other. If one CFM fails, or one phase of the power fails, the other CFM
backs up the mirrored data from its corresponding CPA blade, and no data is
lost. In the unlikely event where a CFM has failed and a full power failure
occurs, the other CFM backs up the mirrored data from the CPA without any
loss of data.

Cache flash memory capacity

The recommended size of the installed cache flash memory depends on the
size of the cache memory, and is automatically selected when defining the
configuration for the system.
The following table shows CFM capacities per controller with both small and
large cache memory backup assemblies.
Number of controllers
1
2
Notes:
1. SDD sizes must be the same in all CFM. Cache must be distributed evenly across CFMs and
controllers.
Note: The small CFM SSDs (128 GB) can be installed in the large cache
backup, allowing for easier and less expensive upgrades.
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
Number of CFM
features (pairs of
boxes)
1 CFM
2 boxes / SSDs
2 CFMs
4 boxes / SSDs
1 CFM
2 boxes / SSDs
2 CFMs
4 boxes / SSDs
Storage system hardware overview
Memory module size
128 GB 256 GB
256 GB 512 GB
128 GB 512 GB
256 GB 1 TB
128 GB 512 GB
256 GB 1 TB
128 GB 1 TB
256 GB 2 TB
1
CFM size
53