Restore (was: swapping LVs about)

[ruscook]

On Mon, 2006-09-04 at 14:23 +0100, Gabriel M Dragffy wrote:

> On Sun, 2006-09-03 at 16:59 +0200, Alexander Skwar wrote:
> > > Now my next question is how to restore them... I have 
> > > backups of the system mounts such as /, /usr, /var etc. Must I boot into
> > > another linux installation or can I somehow do it online?
> > 
> > It very much depends on what kind of restore you're talking
> > about. If you need to restore *everthing*, then yes, I'd suggest
> > to do this from some other distribution, as you might have 
> > problems overwriting certain files in / or /usr.
> > 
> > But if you just need to restore one file, then no, you don't
> > need another distribution. How did you make the backup? Into
> > a cpio/tar or with something like rsnapshot, which will, essentially,
> > just copy all the files over to some other directory?
> 
> I made backups using your advice - partimage! It seems to work well from
> the command line but if you enter the GUI it makes a complete mess of
> listing available volumes. So now I have images of the given
> directories. Just wondering if there was some way to perhaps restore
> the / backup to a new LV and then tell my system to switch to using that
> LV, as I understand I'm not going to be able to restore an online
> filesystem.
> 
> My idea is this:
> 
> /dev/mapper/mainvg-root     mounted as /
> Then make a backup using partimage.
> 
> Create a new LV called /dev/mapper/mainvg-newroot
> Restore the backup to this new LV. And then tell the system to
> use /mainvg-newroot as /.
> 
> Is this possible? Or what other options are there?

Gabe, I use Rsync to sync a couple of partitions that are not exactly
the same size (so mirroring won't work) but do have enough free space to
be *almost* a mirror of each other. Theoretically I can boot off either
partition if I modify grub and fstab.


Kind Regards Russell
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