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1–18 General Description
Cache Module
Each controller requires a companion cache module as shown in Figure 1–8.
Table 1–7 lists the descriptions and part numbers of the cache module. Figure 1–6 on
page 1–13 shows the location of a controller’s companion cache module.
The cache module, which contains up to 512 MB of memory, increases the
subsystem’s I/O performance by providing read, read-ahead, write-through, and
write-back caching. The size of the memory contained in the cache module depends
on the configuration of the DIMMs, with the supported combinations shown in
Table 1–6. For placement of the DIMMs, see the HSZ80 Array Controller ACS
Version 8.3 Maintenance and Service Guide.
Table 1–6 Cache Module Memory Configurations
DIMMs Quantity Memory
32 MB 2 64 MB
32 MB 4 128 MB
128 MB 2 256 MB
128 MB 4 512 MB