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Clustering disabled due to unsynchronized log after a few hours of uptime or after controller replacement with force giveback

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Applies to

This issue might occur with any FAS3210/3240/3270 systems running Data ONTAP versions earlier than 7.3.6P4, 8.0.2P3, 8.1P1 or 8.1.1

Issue

After some period of uptime, with storage failover enabled, a FAS/V3200 series system might encounter an 'unsynchronized log' condition that it cannot recover from. This results in the loss of high-availability failover and SFO will be disabled.

  • This condition is triggered by a timing error in the onboard 10Gb controller firmware that is responsible for storage cluster communications on this platform.
  • This issue might occur with any FAS/V3200A or FAS/V3200AE configuration running Data ONTAP 7.3.5 or 8.0.1.

--OR--

After controller replacement, the down storage system has been booted up to 'waiting for giveback', the partner was not able to giveback gracefully due to 'Partner not waiting for giveback, giveback cancelled'.  After issuing cf giveback -f, a FAS/V32XX series system might encounter an 'unsynchronized log' condition with the cluster being disabled.  This results in the loss of high-availability failover and SFO will be disabled.
â?¢ Master-Slave System-ID issue might be exposed.
â?¢ This issue might occur with any FAS3210/3240/3270 systems running Data ONTAP earlier than 7.3.6P4, 8.0.2P3, 8.1P1 or 8.1.1

The following is a sample output from one of the controllers:
irt-na04*> cf status
irt-na03 is up, takeover disabled because of reason (unsynchronized log)
irt-na04 has disabled takeover by irt-na03 (unsynchronized log)
Interconnect status: down.

 

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