On Mon, Mar 16, 2015 at 10:51:21AM +0100, Kashyap Chamarthy wrote: > On Sun, Mar 15, 2015 at 10:28:30PM +0800, Yitao Jiang wrote: > > Hi,guys > > I wanna to get the disk snapshot size, but found nothing libvirt commands > > related,except qemu-img. > > I create two disk snapshots, but nothing return its' size > > The below does not seem like snapshots. s/not seem like snapshots/not seem like disk snapshots And, by "The below" I was referring to your output from the original email (not what I wrote). > > They're *internal* qcow2 > snapshots (original and delta are on the same file). > > A quick example of disk snapshots: > > List the current active device: > > $ virsh domblklist cirrvm > Target Source > ------------------------------------------------ > hda /var/lib/libvirt/images/cirros-0.3.3-x86_64-disk.img > > Create a 'disk-only' external snapshot: > > $ virsh snapshot-create-as --domain cirrvm snap1 \ > --diskspec vda,file=/export/vmimages/sn1.qcow2 \ > --disk-only --atomic > > List again the current active block device: > > $ virsh domblklist cirrvm > Target Source > ------------------------------------------------ > hda /export/vmimages/sn1.qcow2 > > Get info about the disks involved: > > $ qemu-img info --backing-chain /export/vmimages/sn1.qcow2 > image: /export/vmimages/sn1.qcow2 > file format: qcow2 > virtual size: 39M (41126400 bytes) > disk size: 196K > cluster_size: 65536 > backing file: /var/lib/libvirt/images/cirros-0.3.3-x86_64-disk.img > backing file format: qcow2 > Format specific information: > compat: 1.1 > lazy refcounts: false > > image: /var/lib/libvirt/images/cirros-0.3.3-x86_64-disk.img > file format: qcow2 > virtual size: 39M (41126400 bytes) > disk size: 14M > cluster_size: 65536 > Format specific information: > compat: 0.10 > > -- > /kashyap > > > [root@cskvm01 qcow2]# qemu-img info > > /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 > > image: > > /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 > > file format: qcow2 > > virtual size: 5.0G (5368709120 bytes) > > disk size: 1.0G > > cluster_size: 65536 > > Snapshot list: > > ID TAG VM SIZE DATE VM CLOCK > > 1 4fc42d73-8257-42bd-8807-81700fd3c689 0 2015-03-15 21:05:55 > > 01:05:53.583 > > 2 2fd6aeab-cb26-446d-b1c6-e8d70d33f651 0 2015-03-15 21:50:35 > > 00:00:00.000 > > > > After wrote data to the disk, then create another snapshot > > [root@cskvm01 qcow2]# qemu-img info > > /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 > > image: > > /mnt/e6758700-af68-3c06-ade3-53f5f9b93507/e2cf6551-0d2c-4382-a86c-8ba633954ff2 > > file format: qcow2 > > virtual size: 5.0G (5368709120 bytes) > > disk size: 3.9G > > cluster_size: 65536 > > Snapshot list: > > ID TAG VM SIZE DATE VM CLOCK > > 1 4fc42d73-8257-42bd-8807-81700fd3c689 0 2015-03-15 21:05:55 > > 01:05:53.583 > > 2 2fd6aeab-cb26-446d-b1c6-e8d70d33f651 0 2015-03-15 21:50:35 > > 00:00:00.000 > > 3 63815565-3a06-4366-a1b3-bfeb9c4a07b4 0 2015-03-15 22:22:43 > > 00:00:00.000 > > > > VM SIZE column still show 0 > > > > Here is my environment > > qemu-img version 0.12.1, Copyright (c) 2004-2008 Fabrice Bellard > > libvirtd (libvirt) 0.10.2 > > CentOS release 6.5 (Final) 2.6.32-431.el6.x86_64 > > -- /kashyap _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
