Once the space drops below 200MB all VMs on that volume will enter a paused critical state. Hyper-V will begin writing to the event log when the volume drops below 2GB with an event log entry for each VM. Upon logging in it was apparent something was quite wrong, the failover cluster had failed convergence and the local Hyper-V MMC showed that most over 75% of the VMs were in a paused critical state (see the screenshot below as an example that was reproduced in a lab).Īs it turns out one of the cluster shared volumes had reached a point where > 200MB was remaining on the volume. I was taking some time off when I received a call in the middle of the night that one of my customer’s entire infrastructure was down. So here we are with a nicely virtualized Hyper-V failover cluster, we’ve got excellent guest to host density and everything is going well….until it isn’t. As many of you reading my blog have realized I am a huge proponent of datacenter virtualization.
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