Avago Technologies Syncro 9361-8i - Manual (Page 78)

Avago Technologies
- 78 -
Syncro CS 9361-8i and Syncro CS 9380-8e Solution User Guide 
October 2014
Chapter 4: Troubleshooting
Event Messages and Error Messages
0x01db Information Cache mirroring is online Cache mirroring is established
between the controller and the peer
controller. VDs with write-back cache
enabled are transitioned from
write-through mode to write-back
mode. None - Informational
0x01dc Warning Cache mirroring is offline Cache mirroring is not active between
the controller and the peer controller.
VDs with write-back cache enabled
are transitioned from write-back
mode to write-through mode. This condition can occur if cache coherency is
lost, such as a communication failure with the
peer controller or VD in write-back mode
when pending writes go offline, or with
pinned cache scenarios. To resolve, reestablish
proper cabling and hardware connections to
the peer controller or disposition a controller's
pinned cache.
0x01dd Critical Cached data from peer
controller is unavailable. VD:
access policy
is set to Blocked. The peer controller has cached data
for the affected VDs, but is not present
in the HA domain. The VD access
policy is set to Blocked until the peer
controller can flush the cache data to
the VD. This condition can occur when cache
coherency is lost due to failure of
communication with the peer controller. To
resolve, bring the peer controller online and
reestablish communication paths to the peer
controller. If the peer controller is
unrecoverable, restore data from a backup or
manually set the access policy (data is
unrecoverable).
0x01e9 Critical Direct communication with
peer controller(s) was not
established. Please check
proper cable connections. The peer controller might be passively
detected, but direct
controller-to-controller
communication could not be
established due to a split brain
condition.
A split brain condition occurs when
the two server nodes are not aware of
each other’s existence but can access
the same end device/drive.
Attempts to create a VD that is not supported
by the peer controller result in a creation
failure. To resolve, create a VD that aligns with
the peer controller VD support level.
Attempts to introduce an unsupported VD
that is managed by the peer controller result
in rejection of the VD by the controller. To
resolve, convert the unsupported VD to one
that is supported by both controllers, or
migrate the data to a VD that is supported by
both controllers.
Table 4 HA-DAS MSM Events and Messages (Continued)
Number
Severity
Level
Event Text Cause Resolution