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Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
Table 1–9 shows the cache policies resulting from a full or partial failure of cache
module A’s ECB in a dual-redundant controller configuration. When cache module A
is at least 50% charged, the ECB is still good and is charging. When it is less than
50% charged, the ECB is low, but still charging. The consequences shown are the
opposite for a failure of cache module B’s ECB.
Table 1–8 Cache Policies and Cache Module Status
Cache Module Status Cache Policy
Cache A Cache B Unmirrored Cache Mirrored Cache
Good Good Data loss: No.
Cache policy: Both controllers
support write-back caching.
Failover: No.
Data loss: No.
Cache policy: Both controllers support
write-back caching.
Failover: No.
Multibit
cache
memory
failure
Good Data loss: Forced error and loss of
write-back data for which the
multibit error occurred. Controller A
detects and reports the lost blocks.
Cache policy: Both controllers
support write-back caching.
Failover: No.
Data loss: No. Controller A recovers its
lost write-back data from the mirrored
copy on cache B.
Cache policy: Both controllers support
write-back caching.
Failover: No.