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Shrink VM disc image

Shrinking is not supported by Proxmox

QEMU is not capable to resize ZFS raw data.

Workaround:

  • Shrink disc in guest OS.
  • Move disk to QCOW2 file on local (dir) storage.
  • Set new disk size 
    qemu-img resize --shrink /var/lib/vz/images/703/vm-703-disk-0.qcow2 6G
  • Edit machine config file and set new size: 
    scsi1: rbd:vm-703-disk-2,backup=0,cache=writeback,discard=on,size=6G