Compaq StorageWorks HSZ80 Configuration And Cli Reference Manual page 48

1–26 General Description
Table 1–9 Resulting Cache Policies and ECB Status (Continued)
Cache Module Status
Cache A Cache B
Less than At least
50% 50%
charged charged
Unmirrored Cache
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.
Cache Policy
Mirrored Cache
Data loss: No.
Cache policy: Both controllers continue
to support write-back caching.
Failover: No.