[libvirt-users] virsh create snapshot not honoring diskspec?
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
Checking in if anyone has thoughts on this? Thanks, KiranK On Fri, Aug 7, 2015 at 8:53 AM, Silver Sky Soft Services, Inc. < contactus@silverskysoft.com> 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 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. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
On Thu, Aug 13, 2015 at 1:16 PM, Eric Blake <eblake@redhat.com> wrote:
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.
Thanks Eric. That helped. Although minor note was the option was "snapshot=no" instead of "snapshot=none". Just to put in these archives, the working command: virsh snapshot-create-as --domain cento_os --name snap3 --no-metadata --disk-only --atomic --diskspec vdb,snapshot=no --diskspec vda,snapshot=external -KiranK
participants (2)
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Eric Blake -
Silver Sky Soft Services, Inc.