On Sat, 2011-07-23 at 21:23 -0400, Luke S. Crawford wrote: > On Sat, Jul 23, 2011 at 11:10:51AM -0700, Gregory K. Ruiz-Ade wrote: > > Correct me if I'm wrong, but I had the understanding that neither Xen nor > > KVM were capable of doing VMware-style full-state snapshots at all. I don't > > recall seeing the feature when I was last using XenServer and I know from > > experience that the only snapshotting available on plain Linux > > distributions is to either use LVM and use a logical volume as the VM's > > "disk", or disk images with a tool like qemu-img. > > > > Neither alternative preserves full VM state, though, so if you do a snap on > > Xen or KVM while the VM is running, it's crash-consistent at best. > > to take a full state backup, you must snapshot both the ram and the > disk separately. 'xm save' is the tool to do this to the ram state. > For disk, personally, I use lvm, which has it's own snapshot mechanism. > > I have a backup script [1] that demonstrates how you can 'xm save' > (which pauses the domain) then take a LVM snapshot while the domain > is paused, then 'xm restore' which starts the domain. > > You can avoid the downtime using xm save -c and some scripting, but > I have not done so myself. > > [1]http://book.xen.prgmr.com/mediawiki/index.php/Backup_domain >
xm isn't used in xenserver environments that I know of. I think its just for classic xen. The xenserver and xcp environments use the xe command. As far as I know full state snapshots (with the memory state) are available in the paid versions of xenserver. I am not sure if the feature is available with xcp or not. If you run xen classic you could use the xm pause, save, snapshot, restore method described above. It would be a different incantation with xe or you would use the gui, or script something using the xenapi if your using xenserver or xcp. _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
