[CentOS] Recovering LVM volumes

Thu Feb 3 20:54:46 UTC 2011
Sanjay Arora <sanjay.k.arora at gmail.com>

Thanks guys...will try these!

On Fri, Feb 4, 2011 at 1:08 AM, James A. Peltier <jpeltier at sfu.ca> wrote:
> also, if the disk is multi-disk, which is the case here, you can look into /etc/lvm/backup for LVM meta data information.
>
> ----- Original Message -----
> | Hello all
> |
> | I have two sets of eIDE hard drives from earlier servers, one centos &
> | one fedora. Both were LVM volumes with three or four physical disks,
> | with ext3 fs. One disk, maybe even the boot one may even be missing,
> | either from one or both sets and we do not know the disk order. I got
> | these left from an earlier sysadmin who left the company & nobody know
> | what's what.
> |
> | I need to recover data so I need to backup each of the disks to a disk
> | image file first, then find block-size/recover lvm metadata on the
> | volume, mount the volume to my current server and recover whatever
> | files can be recovered manually.
> |
> | My question is:
> |
> | - what switches to be used with dd in creating the image, so that I
> | retain the lvm disk data, for future recovery, if I mess up the
> | recovery job? Can you please give the actual command assuming disk is
> | connected at /dev/sdb?
> |
> | - How do I find the blocksize used by the disk & how do I get the
> | meta-data and mount the disk to current lvm fs.
> |
> | Request please give me step by step process. I am finding the howtos &
> | examples on the net very daunting as most of them have co-issues of
> | raid etc. Mine is a plain lvm spanning multiple disks.
> |
> | I don't have expertise of this level & suddenly my boss is expecting
> | me to perform a miracle.
> |
> | Please help.
> |
> | With best regards.
> | Sanjay.
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>
> --
> James A. Peltier
> IT Services - Research Computing Group
> Simon Fraser University - Burnaby Campus
> Phone   : 778-782-6573
> Fax     : 778-782-3045
> E-Mail  : jpeltier at sfu.ca
> Website : http://www.sfu.ca/itservices
>          http://blogs.sfu.ca/people/jpeltier
>
>
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