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Re: [linux-lvm] recover a pv from a disk with no partition table



On Mon, 2006-05-01 at 16:55 -0700, David Brown wrote:
> On Mon, May 01, 2006 at 07:47:36PM -0400, Brian J. Murrell wrote:
> > I need to recover a PV from a disk with no partition table.  I have a
> > disk which gives EIO errors trying to read from the first few blocks of,
> > so, no partition table.
> > 
> > Is there any way with LVM2, given that I have
> > the /etc/lvm/backup/<vgname> file that I can determine the offset into
> > the disk where the partition starts, so that I could do:
> 
> The backup files don't list physical offsets.

Indeed.  That's why I used gpart, without success.

> But, you can see the id's for the partitions, and the lvm
> header is at offset 0x200 into the partition.

Yeah, I did notice that on another pv on the system:

# hexdump -C /dev/sda2 | less
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000200  4c 41 42 45 4c 4f 4e 45  01 00 00 00 00 00 00 00  |LABELONE........|
00000210  ad 24 02 c2 20 00 00 00  4c 56 4d 32 20 30 30 31  |­$. ...LVM2 001|
00000220  68 76 37 6b 4e 49 32 4e  72 5a 33 52 73 39 38 5a  |hv7kNI2NrZ3Rs98Z|
00000230  42 65 73 33 53 76 4a 4c  75 68 61 4f 62 6a 53 36  |Bes3SvJLuhaObjS6|

Unfortunately, I am unable to find any "LABELONE" on the PV I am trying
to recover.  I'm getting a bad feeling that that means that the LVM
(device mapper) mappings are gone.  :-(

b.

-- 
My other computer is your Microsoft Windows server.

Brian J. Murrell

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