HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Troubleshooting Information
51HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
Less than
50%
charged.
At least
50%
charged.
Data loss: None.
Cache policy: Controller A
supports write-through caching
only; Controller B supports
writeback caching.
Failover: In Transparent Failover,
all units fail over to Controller B.
In Multiple-bus Failover with
host-assist, only those units that
use writeback caching, such as
RAIDsets and mirrorsets, fail over
to Controller B.
In single-controller
configurations, the controller only
provides write-through caching to
the units.
Data loss: None.
Cache policy: Both controllers
continue to support writeback
caching.
Failover: None.
Failed. At least
50%
charged.
Data loss: None.
Cache policy: Controller A
supports write-through caching
only; Controller B supports
writeback caching.
Failover: In Transparent Failover,
all units fail over to Controller B
and operate normally.
In Multiple-bus Failover with
host-assist, only those units that
use writeback caching, such as
RAIDsets and mirrorsets, fail over
to Controller B.
In single-controller
configurations, the controller only
provides write-through caching to
the units.
Data loss: None.
Cache policy: Both controllers
continue to support writeback
caching.
Failover: None.
Table 9: Resulting Cache Policies—ECB Status (Continued)
ECB Status Cache Policy
Cache A Cache B Unmirrored Cache Mirrored Cache