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I keep getting this error: Windows Cluster Service has become unavailable (temporary or lost quorum); every morning from my 2012 clustered VM's any ideas?

Posted on 2015-02-19
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Last Modified: 2015-03-15
[External] SQL Server Alert System: 'Windows Failover Cluster Service unavailable/AG failover occurred' occurred on XXXXXX

DATE/TIME:      2/19/2015 7:57:42 AM

DESCRIPTION:    (None)

COMMENT:        One or both of the following has occurred:

1. Windows - Windows Cluster Service has become unavailable (temporary or lost quorum);
2. SQL Server - Availability Group lost connection or AG failover has occrurred.

Please check and take appropriate actions.

JOB RUN:        (None)

There are 4 VMware VM's in a SQL 2012 cluster - OS is 2012 as well.  Keep getting these error every morning.  Any ideas?
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Question by:Harper McDonald
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Expert Comment

by:Stefan Hoffmann
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Checking whether option 1. or 2. is true??
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Author Comment

by:Harper McDonald
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This is happening on multiple clusters in our environment - Get-ClusterLog generates cluster.log but there is nothing that shows why / what...Event logs don't really say much just that the quorum as been lost.  Our network team has looked into it and nothing in three logs.  We are running in a FlexPod environment with UCS / netapps and Nexus switches so it's up to date gear.  Didn't know if someone might be having the same issue or a solution.  These are VMware clusters and the NIC's all have the VMXNET3 driver for the NIC.
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Expert Comment

by:Stefan Hoffmann
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Three logs sounds like not that much, or do you have log consolidation?

You need to correlate all logs using the timestamp from the above error message +/- a meaningful grace period...
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Author Comment

by:Harper McDonald
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We have tried even with SQL logs and in verbose mode.   It's very strange - We have even increased the VM resources.
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by:Stefan Hoffmann
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Does it happen at the same time or is there any other pattern?
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Author Comment

by:Harper McDonald
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It usually happens very early in the mornings but not really much of a pattern.  I need to get with the backup admin and see if jobs run on specific clusters at that time...might bring some light.
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Expert Comment

by:Vitor Montalvão
Comment Utility
The AG depends on the Windows cluster so the 2nd error should be derived from me first one.
The quorum it's the only resource that is shared so I would check with the storage guys what's happening with that disk.
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Accepted Solution

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Harper McDonald earned 0 total points
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Removed vNIC and reinstalled on cluster nodes.
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Author Closing Comment

by:Harper McDonald
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It fixed the problem.
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