Unable to resume pve-data

I have a problem that has just occurred after a reboot of my main proxmox server.

During boot I get an error that the server "Couldn't find device with UUID xxxxx...." [This UUID is for the /dev/pve/data LV]
I can Control-D to continue and the system boots, however, due to the error above, I cannot start or in any way use any VMs.

My configuration is this
LSI 2108 PCIe Card
320Gb RAID1 [/root, /swap, /boot]
6TB RAID5 [/data]

I have booted into grml in an attempt to recover the data of the RAID5 and rebuild the server, however, I am seeing the following:

root@grml# vgchange -a y /dev/pve
Couldn't find device with UUID VSKDXQ.....
Refusing activation of partial LV data. Use --partial to override.
2 logical volume(s) in volume group "pve" now active

root@grml# vgchange -a y --partial /dev/pve
Partial mode. Incomplete logical volumes will be processed.
Couldn't find device with uuid VSKDXQ....
device-mapper: resume ioctl failed: Invalid argument
Unable to resume pve-data (254:3)
3 logical volume(s) in volume group "pve" now active

Even though it says 3 volumes active, the data volume does not show under /dev/pve and if I attempt to mount it:

root@grml# mount /dev/pve/data /mnt/pve
mount: special device /dev/pve/data does not exist


I am unsure what I can do next. I have checked the RAID there are no failures and the verify is sucessful. Is there anything I can do to attempt to restore the server to working, or if it is a lost cause, are there any other avenues I can explore to try and recover the data from this LV? I have copies of all except 1 VM and I would really like to recover it if I can.

Matthew