Re: [OT?] LVM questions - I have seriously screwed my system

[Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de>]

lsorense@csclub.uwaterloo.ca (Lennart Sorensen) writes:

> On Thu, Oct 20, 2005 at 03:54:12PM +0200, Goswin von Brederlow wrote:
>> Mounting totaly ignores the partition type anyway. So that did
>> nothing. But running pvcreate will have overwritten some data.
>
> Well if pvcreate was run, and that is all, perhaps looking at the lvm
> backup data in /etc can tell what the UUID used to be and pvcreate might
> allow you to tell it what uuid you want used on that device.  Then lvm
> should recognize it again.  pvcreate doesn't overwrite the data area of
> a pv, just the block containing the size and uuid and such (and the size
> shouldn't have changed).  Unless I am missing something in my
> understanding of LVM that is.  If it was not previously an lvm device,
> then year whatever was there is not hurt badly.
>
>> Try mounting with an alternate superblock and mount read-only and save
>> whatever you can.
>
> Len Sorensen

If I read that very confusing mail right then he did run pvcreate on
an ext3 filesystem. So the first superblock is probably wiped.

MfG
        Goswin