2009/12/28 Pasi Kärkkäinen <[email protected]> > On Mon, Dec 28, 2009 at 03:51:59PM +0000, John Haxby wrote: > > 2009/12/28 J Newbie <[1][email protected]> > > > > Btw, any other recommendation for backing up virtual machines. > > > [snip client-hosted backup] > > > > We'd really need something like Windows VSS, to be able to coordinate > the disk snapshots with the apps running in the guest.. > > That is possible and you don't need any especial software to do it. At least I didn't, not quite anyway.
I had a shell script that put the applications I was interested in into a "safe" state -- depending on the application this was either a suspend or just shutting it down (sendmail, for that one) -- did a sync and the reported back to the host that the guest was ready for a snapshot. When the snapshot had been taken the applications were either allowed to continue or restarted as necessary. This isn't perfect: the guest file systems are still marked dirty, but the sync ensures (I hope) that all the data is recoverable. Getting clean file systems would require a change to the kernel so that all disk activity is stopped and the various file systems are briefly marked clean while the snapshot is taken. I don't know if anyone, anywhere, is looking at that. jch
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