Yesterday my electric was cut and my UPS's ran down, finally my proxmox server lost power. Once the power was restored all other server came back online except one. Currently when booting I get to the grub rescue shell. Code: error: unknown filesystem Entering rescue mode... I see the following with ls Code: grub rescue> ls (hd0) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1) (lvm/pve-root) (lvm/pve-swap) I have tried doing an ls with each one and I get the same result regardless Code: grub rescue> ls (lvm/pve-root) (lvm/pve-root): Filesystem is unknown grub rescue> ls (lvm/pve-root)/ error: unknown filesystem I have booted into a live ubuntu CD, checking fdisk -l Code: # fdisk -l Disk /dev/sda: 931.5GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physcial): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disklabel type: gpt Disk identifier: 7C6C8CF5-63CC-497D-A1D9-A3108D2E36DA Device Start End Sectors Size Type /dev/sda1 34 2047 2014 10007K BIOS boot /dev/sda2 2048 262143 260096 127M EFI System /dev/sda3 262144 1953525134 1953262991 931.4G Linux LVM Partition 1 does not start on a physical sector boundary Disk /dev/mapper/pve-swap: 8GiB, 8589934592 bytes, 16777216 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum,optimal): 4096 bytes / 4096 bytes Disk /dev/mapper/pve-root: 96 GiB, 103079215104 bytes, 201326592 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum,optimal): 4096 bytes / 4096 bytes Code: # parted /dev/sda p Model: ATA TOSHIBA HDWJ110 (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Disk Flags: Number start End size File system Name Flags 1 17.4kB 1049kB 1031kB bios_grub 2 1049kB 134MB 133MB fat32 boot, esp 3 134MB 1000GB 1000GB lvm There is some more info below, but I include the main parts Code: # pvs;lvs PV VG Fmt Attr PSize PFree /dev/sda3 pve lvm2 a-- <931.39g 15.79g LV VG Fmt Attr PSize PFree data root swap vm-103-disk-1 vm-104-disk-1 vm-113-disk-1 vm-134-disk-1 It appears the disks are there, what would be the best way to backup the vm's or repair the disk?