====== 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 (i.e. using gparted to a bit smaller than desired block device size)
  * Change VM disc size. Two ways:
  * 1) Clean and safe (but long):
    * ''Move disk'' to QCOW2 file on ''local'' (dir) storage.
    * Set new disk size <code bash>qemu-img resize --shrink /var/lib/vz/images/703/vm-703-disk-0.qcow2 6G</code>
  * 2) Directly change ZFS volume size:
    * ''zfs set volsize=4GB hddpool/data/vm-123-0''
  * Edit machine config file and set new size: <file /etc/pve/local/qemu-server/703.conf>scsi1: rbd:vm-703-disk-2,backup=0,cache=writeback,discard=on,size=6G</file>