On 02/11/2013 03:02 PM, Wido den Hollander wrote: > You are looking at a way to "extract" the snapshot, correct? No. > Why would > you want to mount it and backup the files? because then I can do things like incremental backups. There will be a ceph cluster at an ISP soon, who hosts various services on various VMs, and it is important that the mailspool for example is backed up efficiently, because it's huge and the number of files is also high. > Couldn't you better handle this in the Virtual Machine itself? not really. open, changing files, a lot of virtual machines that one needs to take care of, and so on. > If you want to backup the virtual machines to an extern location you > could use either "rbd" or "qemu-img" to get the snapshot out of the Ceph > cluster: > > $ rbd export --snap <snapshot> <image name> <destination> > > Or use qemu-img > > $ qemu-img convert -f raw -O qcow2 -s <snapshot> rbd:rbd/<image> > <image>.qcow2 > > You then get files which you can backup externally. > > Would that work? sure, but this is a very inefficient way of backing things up, because one would back up on block level. I want to back up on filesystem level. > Wido > >> thanks a lot for you answers >> Wolfgang >> > > -- DI (FH) Wolfgang Hennerbichler Software Development Unit Advanced Computing Technologies RISC Software GmbH A company of the Johannes Kepler University Linz IT-Center Softwarepark 35 4232 Hagenberg Austria Phone: +43 7236 3343 245 Fax: +43 7236 3343 250 wolfgang.hennerbichler@xxxxxxxxxxxxxxxx http://www.risc-software.at _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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