HP Array Controller HSG V8.7 Software - Manual (Page 42)

1–18 HSG80 User’s Guide
Cache Module
Each controller requires a companion cache module as shown in Figure
1–9. Figure 1–7 on page 1–13 shows the location of a controller’s
companion cache module. The cache module, which can contain 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 “Replacing DIMMs,”
page 5–42.
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