Show OpenVZ containers' disk use in GB and as percentage of the host's total disk space. Tested with Proxmox VE.

container-disk-use.sh

#!/bin/bash
# jnm 20140311
TOTAL_AVAILABLE=$(df /vz | grep '/vz$' | awk '{ print $2 }')
vzlist -o ctid,numproc,status,ip,hostname,diskspace -s diskspace | awk '
{
        printf $0 "\t"
        if(NR==1)
        {
                print "in G\tas % of host"
        }
        else
        {
                printf "%2.f\t%0.f\n", $NF / 1024 / 1024, $NF * 100 / $TOTAL_AVAILABLE
        }
}'