Volume Group disappeared

Yesterday after rebooting my proxmox host it stopped in "emergency mode" because it could not mount a volume it was using as a second non boot disk in a linux VM running Plexserver.

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I got past the stalled boot up process by adding "nofail" to /etc/fstab mount line at the console:
LABEL=PlexStorage /mnt/pve/PlexMediaHDD ext4 defaults,nofail 0 2

While that allowed the host boot up to finish and my other VMs to run, the Plex VM won't start at all, and when I looked up the...

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