Compaq HSZ80 manual Cache Module Memory Configurations, 18General Description

1–18General Description

Cache Module

Each controller requires a companion cache module as shown in Figure 1–8.

Table 1–7lists the descriptions and part numbers of the cache module. Figure 1–6 on page 1–13shows 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