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1–24 General Description
DIMM or
cache
memory
controller
chip
failure
Good Data integrity: Write-back data that
was not written to media when
failure occurred was not recovered.
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. All units with lost data
become inoperative until you clear
them with the CLEAR LOST_DATA
command. Units that didn’t lose data
operate normally on controller B.
In single controller configurations,
RAIDsets, mirrorsets, and all units
with lost data become inoperative.
Although you can clear the lost data
errors on some units, RAIDsets and
mirrorsets remain inoperative until
you repair or replace the nonvolatile
memory on cache A.
Data integrity: Controller A recovers all
of its write-back data from the
mirrored copy on cache B.
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.
Table 1–8 Cache Policies and Cache Module Status (Continued)
Cache Module Status Cache Policy
Cache A Cache B Unmirrored Cache Mirrored Cache