Daniel P. Berrange wrote: >> 5. Snapshots : where are snapshots saved ? I tried savevm with /tmp/x, I was >> expecting a >> file containing memory image... do these work differrently ? >> Also, when one does loadvm, is the snapshot gone ? I mean can one restore >> the same >> snapshot multiple times ? >> > > libvirt has APIs for snapshotting, but we've not implement them for QEMU > or KVM yet. You can save the file to any location you have write permissions > for. Its not a plain memory image because it also contains info about the > state of all the various virtual devices. > > The snapshot doesn't deal with changes in state on your disks. So if you > restored > a snapshot, ran it for a while doing disk IO and then quit & tried to restore > the > snapshot again your disks would be out of sync. > > That said if one could take snapshots of the disks (eg with LVM, or QCOW) then > it ought to be possible to use a snapshot multiple times over. >
With QEMU 0.9.0 (and by extension, KVM), snapshots are actually stored as part of the disk image with qcow2. This allows you to have a consistent snapshot that includes CPU state and disk state. Regards, Anthony Liguori > Dan. > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ kvm-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kvm-devel
