Specifications

1–15
Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
Cache Module
Each controller requires a companion cache module as shown in Figure 1–5.
Figure 1–3 on page 1–10, 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 1–5. For placement
of the DIMMs, see the HSG80 Array Controller ACS Version 8.3 and 8.4
Maintenance and Service Guide.
Table 1–5. 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