Technical data

4–18 Troubleshooting
Table 4–2 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.