On Tue, Jun 21, 2011 at 2:53 PM, Eric Blake <eblake@xxxxxxxxxx> wrote: > On 06/21/2011 04:30 AM, Daniel P. Berrange wrote: >>> Upstream qemu is developing a 'live snapshot' feature, which allows the >>> creation of a snapshot without the current downtime of several seconds >>> required by the current 'savevm' monitor command, as well as means for >>> controlling applications (libvirt) to request that qemu pause I/O to a >>> particular disk, then externally perform a snapshot, then tell qemu to >>> resume I/O (perhaps on a different file name or fd from the host, but >>> with no change to the contents seen by the guest). Eventually, these >>> changes will make it possible for libvirt to create fast snapshots of >>> LVM partitions or btrfs files for guest disk images, as well as to >> >> Actually, IIUC, the QEMU 'live snapshot' feature is only for special >> disk formats like qcow2, qed, etc. > > Does anyone have pointers to the qemu implementation of monitor commands > used for live snapshot? http://repo.or.cz/w/qemu.git/blob/HEAD:/blockdev.c#l572 Jes implemented the snapshot_blkdev command and is integrating guest agent fsfreeze support. I think it needs to be a multi-step process instead of just one command so that libvirt can do storage management for LVM and co. Stefan -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list