Hi,

I'm trying to create a snapshot on a specific disk by using diskspec option. However, libvirt/virsh seems to ignore it and takes a snapshot of all disks. Am I using this option incorrectly?

In below examples, I'm trying to snapshot only vdb. However even vda is getting snapshotted regardless of diskspec. Is this a known issue?

I'm on CentOS 7.1, libvirtd (libvirt) 1.2.8, virsh 1.2.8

[root@localhost scripts]# virsh domblklist centos_nfs 

Target     Source

------------------------------------------------

vda        /var/lib/libvirt/images/centos_nfs.SNAP_2015-08-07-081800

vdb        /var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-081800

hdc        -

 

[root@localhost scripts]# virsh snapshot-create-as --domain centos_nfs --name SNAP_2015-08-07-090909 --no-metadata --disk-only --atomic --diskspec vdb,snapshot=external

Domain snapshot SNAP_2015-08-07-090909 created

[root@localhost scripts]# virsh domblklist centos_nfs

Target     Source

------------------------------------------------

vda        /var/lib/libvirt/images/centos_nfs.SNAP_2015-08-07-090909

vdb        /var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-090909

hdc        -

[root@localhost scripts]# virsh snapshot-create-as --domain centos_nfs --name SNAP_2015-08-07-101010 --no-metadata --disk-only --atomic --diskspec vdb,snapshot=external,file=/var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-101010 

Domain snapshot SNAP_2015-08-07-101010 created

[root@localhost scripts]# virsh domblklist centos_nfs 

Target     Source

------------------------------------------------

vda        /var/lib/libvirt/images/centos_nfs.SNAP_2015-08-07-101010

vdb        /var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-101010

hdc        -

Thanks,

KiranK