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

On 08/07/2015 09:53 AM, Silver Sky Soft Services, Inc. wrote: > 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 This command line did not give a diskspec for vda, so the action for vda defaults to whatever the <domain> XML says is default for that disk . Try giving: --diskspec vdb,snapshot=external --diskspec vda,snapshot=none to explicitly override the <domain> defaults for both disks at once.