Availability Group WSFC Failovers During VM Movement

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If you experience a WSFC failover during a VMware vMotion / Hyper-V Live Migration with your virtualized SQL Servers when using Availability Groups, you might have server and/or networking hardware that takes a bit longer than usual to handle the network port failover. This can lead to short unexpected outages in your application during the failover. The added latency in the infrastructure could trigger this failover from the cluster monitoring agents and their very short latency hitting that threshold too quickly.

In this case, you need to handle the cluster monitoring network settings in the same manner that Microsoft recommends for these types of VMs on Azure – relax the monitoring thresholds by a small amount. To learn more about how to adjust these values, read more here. Just remember to adjust these settings very gradually!

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