kvm

virsh domblklist ${VM}
virsh blockcommit ${VM} vda --pivot
virsh domblklist ${VM}

# list snapshots
virsh snapshot-list ${VM}

# delete snapshot
virsh snapshot-delete ${VM} ${TIMESTAMP} --metadata

# fix "error: block copy still active: disk 'vda' already in active block job"
VM=vm1
virsh blockjob ${VM} vda --abort
virsh blockcommit ${VM} vda --pivot
virsh snapshot-list ${VM}
SNAP=1527804440
virsh snapshot-delete ${VM} ${SNAP} --metadata

# list snapshots
for VM in $(virsh list --state-running --name); do
echo ${VM}
virsh domblklist ${VM}