In one particular case I can cause it to happen every time, and others I have to dig back through historical cluster event logs to find that it did happen a few times over the last 3 months. I'm not seeing this in all cases but I am definitely seeing it happen. I'm seeing situations where this ping drop will cause the Windows Failover Cluster to perceive a failure and cause the databases to fail over to the other node. My issue relates to trying to use Veeam to backup Exchange 2010 VMs that are in a DAG. This happens whether using guest quiesce or not and goes on for longer if you snapshot memory. When taking a snapshot in vSphere 4, the VM usually drops a single ping as part of the process. I realize up front that this is a VMware issue and not a Veeam issue, but am posting here since I'm curious what others are seeing.
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