External Snapshot of raw images

When external snapshot of raw image is taken, delta is taken into qcow2 files.

virsh # list
Id    Name                           State
—————————————————-
4     cbtool                         running
6     master                         running

virsh # snapshot-create-as master snap1-master “snap1” –diskspec vda,file=/home/snap1.qcow2   –disk-only –atomic

Domain snapshot snap2-master created

snapshots tree :

virsh # snapshot-list  master –tree
snap1-master

virsh # snapshot-create-as master snap2-master “snap2” –diskspec vda,file=/home/snap2.qcow2   –disk-only  –atomic
Domain snapshot snap2-master created
virsh # snapshot-list  master –tree
snap1-master
|
+- snap2-master

Image info:

qemu-img info  /home/snap2.qcow2
image: /home/snap2.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 196K
cluster_size: 65536
backing file: /home/snap1.qcow2
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false

How to Delete:

virsh # snapshot-list master
Name                 Creation Time             State
————————————————————
snap2-master         2016-01-07 03:38:10 -0500 disk-snapshot

virsh # snapshot-delete master snap2-master –metadata
Domain snapshot snap2-master deleted