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Re: [Xen-users] Backup domU image at runtime
2012/3/9 Simon Hobson <linux@xxxxxxxxxxxxxxxx>
That's not a theoretical risk, it is a most definite and demonstrable problem.
I think that taking a backup of a virtual disk while it is used is even worse: if you yank the power cord and you are using a journaled file system, the file system will probably recover by itself.
If you backup a virtual disk while it is used you are taking an inconsistent image of the journal and an inconsistent (corrupted) image of the files!
I think that the risk will always be high: you cannot be guaranteed that no process will write any file during the backup, and you have no way to check if the backup is working (the os will see the filesystem as ok, but application data could still be corrupted)
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