vSphere 7: Performing a Reconfigure for VMware HA operation on a primary node causes an unexpected virtual machine failover

When updating to vCenter Server 7.0 Update 1, you may see error in the Skyline Health, telling you something like this:

“When you perform a Reconfigure for VMware HA operation on the primary node in an HA cluster, an unexpected virtual machine failover occurs for the virtual machines running on that primary node.W

It’s because the timeout settings in the HA needs to be changed to support this, luckily VMWARE provided a KB article about how to fix:

Performing a Reconfigure for VMware HA operation on a primary node causes an unexpected virtual machine failover (2017778)

So basically, edit your HA in Adv. settings and add (or change):

For 7.0U1 or greater:
das.config.fdm.unknownStateMonitorPeriod = 30
Pre 7.0U1:
das.config.fdm.policy.unknownStateMonitorPeriod = 30

It was 10 earlier.

 

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