For the Live Snapshot merge you can either rely on: - Block Streaming or - Block Commit
(Check: http://wiki.qemu-project.org/Features/Snapshots for more info) WORKAROUND is to use Block Streaming: (1) Virtual machine uses its qcow2 image disk: ---- inaddy@(kvm01):~$ sudo ls /var/lib/libvirt/images guest.qcow2 ---- (2) External snapshot is done: ---- inaddy@(kvm01):~$ sudo virsh snapshot-create-as --domain guest --disk-only --atomic Domain snapshot 1486936526 created ---- (3) From this moment on the new data is being committed into the new image. Old image is still referenced since the new image doesn't contain data from the underlying one. ---- inaddy@(kvm01):~$ sudo ls /var/lib/libvirt/images guest.1486936526 guest.qcow2 inaddy@(kvm01):~$ sudo qemu-img info --backing-chain /var/lib/libvirt/images/guest.1486936526 image: /var/lib/libvirt/images/guest.1486936526 file format: qcow2 virtual size: 30G (32212254720 bytes) disk size: 4.9M cluster_size: 65536 backing file: /var/lib/libvirt/images/guest.qcow2 backing file format: qcow2 Format specific information: compat: 1.1 lazy refcounts: false image: /var/lib/libvirt/images/guest.qcow2 file format: qcow2 virtual size: 30G (32212254720 bytes) disk size: 2.1G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false ---- This means that you can "copy" (cp/scp/sftp/rsync/tar) the original image (guest.qcow2) since it is not being updated anymore, but, you still can't move or remove it at this point since its being referenced by the new one. (4) Pull all data from original disk (into the new one, so the dependency is no longer. ---- inaddy@(kvm01):~$ virsh blockpull --domain guest --path /var/lib/libvirt/images/guest.1486936526 Block Pull started <wait until the blockpull is over> inaddy@(kvm01):~$ sudo qemu-img info --backing-chain /var/lib/libvirt/images/guest.1486936526 image: /var/lib/libvirt/images/guest.1486936526 file format: qcow2 virtual size: 30G (32212254720 bytes) disk size: 2.0G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false ---- (5) After blockpull, the VM only depends on the qcow2 image it is referencing: ---- inaddy@(kvm01):~$ virsh domblklist guest Target Source ------------------------------------------------ vda /var/lib/libvirt/images/guest.1486936526 hda - inaddy@(kvm01):~$ sudo rm /var/lib/libvirt/images/guest.qcow2 ---- Will get back soon with more info on the "Block Commit" support for Trusty. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1317491 Title: virsh blockcommit hangs at 100% To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1317491/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
