[Sussex] Retrieving part of an LVM Volume...

[Andy Smith]

On Tue, Feb 27, 2007 at 05:01:57PM +0000, Richie Jarvis wrote:
> I have a bit of a prob at the moment.  One of my MythTV disks has just 
> died (making a lovely 'Clunk' noise every second or so - nice!)  Anyway, 
> this disk was part of an LVM volume spanning 2 disks called 
> /dev/MythGroup/MythVol.  The other disk is still fine, and I can read it 
> without problem.  Now, as LVM is a simple soul, and the failed disk was 
> the second disk, in theory, I should be able to recover the files on the 
> first disk, as they should have been written from the start onwards - 
> the question is how?

I believe you will need to issue

# vgchange -P -ay

the -P telling it that it should assemble only partially-accessible
volume groups substituting /dev/ioerror for the missing PVs.  I have
never attempted this.  This should work, if it doesn't then I would
suggest your next port of call is the lvm list which is very good.

> Obviously, as this is just TV, its not urgent or anything, it would just 
> be nice :)

disks are cheap, human time isn't, I suggest software RAID for any
multi-disk LVM setup.

Cheers,
Andy

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