Specifications

4–16 Compaq StorageWorks HSG80 Array Controller ACS Version 8.5 Maintenance and Service Guide
Table 4–3 Resulting Cache Policies—ECB Status
Cache Module Status Cache Policy
Cache A Cache B Unmirrored Cache Mirrored Cache
At least
50%
charged.
At least
50%
charged.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.
Less than
50%
charged.
At least
50%
charged.
Data loss: No.
Cache policy: Controller A supports
write-through caching only; controller B
supports write-back caching.
Failover: In transparent failover, all units
failover to controller B.
In multiple-bus failover with host-assist,
only those units that use write-back
caching, such as RAIDsets and mirrorsets,
failover to controller B.
In single-controller configurations, the
controller only provides write-through
caching to its units.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.
Failed. At least
50%
charged.
Data loss: No.
Cache policy: Controller A supports
write-through caching only; controller B
supports write-back caching.
Failover: In transparent failover, all units
failover to controller B and operate
normally.
In multiple-bus failover with host-assist,
only those units that use write-back
caching, such as RAIDsets and mirrorsets,
failover to controller B.
In single-controller configurations, the
controller only provides write-through
caching to its units.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.