[linux-lvm] Snapshot question...
Dan Kegel
dank at kegel.com
Tue Apr 22 16:54:39 UTC 2008
On Tue, Apr 22, 2008 at 9:38 AM, Stephane Chazelas
<stephane.chazelas at emerson.com> wrote:
> actually I've spent the last 3 days trying to put zumastor (well
> actually ddsnap as I didn't use zumastor in the end) in place
> here.
>
> The fact that there are user space daemons involved in the
> process make it very difficult to use it for the root file
> system. I had to use a number of hacks for that.
You're braver than us. We haven't tried using it for the root fs yet.
> Also, it seems that you can't snapshot a live (mounted) file
> system as you would do with LVM2 unless you have setup that FS
> beforehand as a virtual ddsnap device (LVM2 is able to suspend
> the device, and reload it as a snapshot_origin for that, I
> couldn't manage to do the same with ddsnap).
Hmm. I'll bring up that use case with Dan Phillips, see what he says.
> I also tried applying the patches to 2.6.25 and got some oops
> (2.6.24.2 is fine though).
>
> Once I've finalised it, I can post what I've come up with if
> anyone is interested.
Please do (heck, post it to the zumastor list, too).
- Dan
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