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Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
External Cache Battery
To preserve the write-back cache data in the event of a primary power failure, a cache
module must be connected to an ECB or a UPS.
Compaq supplies two versions of ECBs: a single-battery ECB for single controller
configurations, and a dual-battery ECB for dual-redundant controller configurations,
which is shown in Figure 1–9. When the batteries are fully charged, an ECB can
preserve 512 MB of cache memory for 24 hours. However, the battery capacity
depends upon the size of memory contained in the cache module, which are listed in
Table 1–10.
Table 1–10 ECB Capacity Based on Memory Size
Size DIMM Combinations Capacity
64 MB Two, 32 MB each 96 hours
128 MB Four, 32 MB each 48 hours
256 MB Two, 128 MB each 48 hours
512 MB Four, 128 MB each 24 hours