On Fri, Feb 07, 2020 at 15:25:22 +0100, Lentes, Bernd wrote: > Hi, > > i'm cuurently a bit confused if a guest does have a valid snapshot or not. > This is the xml: > ... > <disk type='file' device='disk'> > <driver name='qemu' type='qcow2'/> > <source file='/var/lib/libvirt/images/crispor_1604/crispor_1604.sn'/> > <backingStore type='file' index='1'> > <format type='raw'/> > <source file='/var/lib/libvirt/images/crispor_1604/crispor_1604.img'/> > <backingStore/> > </backingStore> > <target dev='vda' bus='virtio'/> > <alias name='virtio-disk0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> > </disk> > ... > > both files are currently in access by the respective qemu process. > lsof: > qemu-kvm 19533 root 13u REG 253,0 29761732608 12091393 /var/lib/libvirt/images/crispor_1604/crispor_1604.sn > qemu-kvm 19533 root 14r REG 253,0 111561775513 44793857 /var/lib/libvirt/images/crispor_1604/crispor_1604.img > > Here are both files: > pc60181:/var/lib/libvirt/images/crispor_1604 # ll > ... > -rw------- 1 root root 111561775513 Oct 22 15:23 crispor_1604.img > -rw-r--r-- 1 root root 29761732608 Feb 7 15:13 crispor_1604.sn > > crispor_1604.sn has a recent timestamp. > > The snapshot is currently in use: > virsh # domblklist crispor_1604 > Target Source > ------------------------------------------------ > vda /var/lib/libvirt/images/crispor_1604/crispor_1604.sn > > > But virsh does not show any snapshot: > > virsh # snapshot-list crispor_1604 > Name Creation Time State > ------------------------------------------------------------ > Libvirt is probably lacking the metadata for the snapshot. That is not a problem though, because since libvirt doesn't support deletion of external snapshots anyways currently you'd need to use the below approach anyways. > So i'm a bit confused. Does it have a valid snapshot or not. How can i find out and how can i get rid of it ? virsh blockcommit crispor_1604 vda --active --pivot in the case above. that merges the file='/var/lib/libvirt/images/crispor_1604/crispor_1604.sn'/ into file='/var/lib/libvirt/images/crispor_1604/crispor_1604.img'/ and finishes the job. If you have more complex backing chain you might want to use the --top and --base arguments to control which portion to merge as the command I've suggested merges everything into the bottom-most image.
