Thanks - I'll go digging :-)
> -----Original Message-----
> From: David Masover [mailto:[EMAIL PROTECTED]
> Sent: 10 November 2006 17:45
> To: Roger Lucas
> Cc: [email protected]
> Subject: Re: reiserfsck with LVM read-only snapshot
>
> Roger Lucas wrote:
>
> > Hmmm. I'm not sure about dm_snapshot having not used it before and LVM
> > seems to work pretty well
> (at least as far as its
> > capabilities allow). I'm open to all suggestions, however.
>
> I'm not sure exactly where to point you to, though. The scary thing
> about dm_snapshot is that there's so little documentation.
>
> No, wait, looks like there is. Check a copy of the kernel source:
>
> Documentation/device-mapper/snapshot.txt
>
> You should be able to get it to work, even on top of LVM. But, if you're
> only using LVM for snapshots, you might consider using device-mapper
> directly instead.
>
> Try it out on some loop devices first to get an idea of how it works.
> You know, little 10 meg files with an ext2 fs, set up with losetup (not
> mount -o loop), then you can play with dmsetup. As far as I know, any
> device-mapper device can be created from any block device, period --
> dmraid works by creating dm_linear devices to represent the partitions
> of, say, a dm_stripe device. No performance hit that I can tell.
>
> If you need more help with that, let me know.
