Hitachi Virtual Storage Platform, User And Reference Manual

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System Components
3–13
Hitachi VSP User and Reference Guide
Cache memory
The Virtual Storage Platform can be configured with up to 256 GB of cache
memory per controller chassis (512 GB for a two-module system). Each
controller chassis can contain from two to eight cache memory adapter
boards. Each board contains from 8 GB to 32 GB.
Cache memory adapter boards are installed in pairs and work together to
provide cache and shared memory for the system. Each pair is called a
cluster. From one to four cache clusters can be installed in a controller
chassis. In addition to the memory on the cache boards, 4 GB of cache
memory is also located on each Virtual Storage Director (microprocessor)
board. See the following illustration.
Figure 3-11 Cache memory
Item Description Item Description
Virtual Storage Director (VSD)
(microprocessor)
Includes 4 GB cache Cache Memory Adapter
8, 16, or 24 GB standard
32 GB optional
1 or 2 16 GB SSD drives
VSD Cluster 0 VSD Cluster 1
Cache cluster 0 Cache cluster 1
Cache cluster 2 Cache cluster 3