Cluster monitor: takeover of filerB disabled (status of backup mailbox is uncertain)
Example: Sat Sep 30 12:18:10 CEST [filerA: cf.fsm.takeoverOfPartnerDisabled:notice]: Cluster monitor: takeover of filerB disabled (status of backup mailbox is uncertain)
Cause: FilerA has disabled clustering because it cannot determine the status of the backup mailbox disk. When a mailbox disk becomes unreadable, the local node cannot accurately determine the state of the partner. If the Interconnect link is still enabled, clustering is disabled because the filer cannot accurately determine whether the drives are still accessible on its partner.
If the error clears within a minute, check whether the disk was updating firmware at the time of the error. During a disk firmware upgrade, the disk will be taken offline briefly, creating the false positive error message.
For FC-AL loops, run the fcadmin link_stats command several times over the course of 5 minutes to see whether errors are incrementing on the loop. For SAS systems, use sasadmin dev_stats to look for incrementing errors. If errors are incrementing, perform further troubleshooting to isolate the problematic component.
If the problem clears without manual intervention, monitor the system for a reoccurrence. It may have been caused by a transient condition that caused the filer to miss an update to the mailbox disk.
Be sure to check the logs on both filers.
sysconfig -v Show the firmware versions - At top or report - Multipath status
storage show disk -p - Have you go the cables correct A to B and B ot A?