LVM restore / recovery Post: 302243873

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Special Forums Hardware Filesystems, Disks and Memory LVM restore / recovery Post 302243873 by Zburatorul on Monday 6th of October 2008 06:36:21 PM

10-06-2008

Registered User

LVM restore / recovery

Hello,

I would really appreciate help on recovering some data.

I have a RAID1 array under /dev/md0 composed of devices /dev/sdb and /dev/sdc. I had lvm on the raid with 3 lv, the last of which was a snapshot partition.

My / is on /dev/sda. Recently, I reinstalled the system (Debian lenny) and reconfigured /dev/sda with lvm.
When I booted, the system correctly determined the presence of the RAID array and even activated it. All I had to do is import /dev/md0 back into the system.

However, out of stupidity, I ran

Code:

    # sudo pvcreate -v /dev/md0
    Set up physical volume for "/dev/md0" with 488396928 available sectors
    Zeroing start of device /dev/md0
  Physical volume "/dev/md0" successfully created

As it says, it overwrote the start of the device, the data is has not been affected. Now I don't know how to access the LVs on /dev/md0.

Does anyone have any suggestions on how to recover the information about the lvm volumes on the disk?

I do not have the backup file of the volume group on the raid, as I just reinstalled the system over it. Otherwise I would have just followed the instructions here.

Thank you in advance.

Zburatorul

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LEARN ABOUT BSD

vgimportclone

VGIMPORTCLONE(8)					      System Manager's Manual						  VGIMPORTCLONE(8)

NAME
       vgimportclone - import and rename duplicated volume group (e.g. a hardware snapshot)

SYNOPSIS
       vgimportclone [-n|--basevgname VolumeGroupName] [-i|--import] PhysicalVolume [PhysicalVolume...]

DESCRIPTION
       vgimportclone is used to import a duplicated VG (e.g. hardware snapshot).  Duplicate VG(s) and PV(s) are not able to be used until they are
       made to coexist with the origin VG(s) and PV(s).  vgimportclone renames the VG associated with the specified PV(s) and changes the  associ-
       ated VG and PV UUIDs.

OPTIONS
       See lvm for common options.

       -n|--basevgname VolumeGroupName
	      By  default  the	snapshot  VG  will be renamed to the original name plus a numeric suffix to avoid duplicate naming (e.g. 'test_vg'
	      would be renamed to 'test_vg1').	This option will override the base VG name that is used for all  VG  renames.	If  a  VG  already
	      exists with the specified name a numeric suffix will be added (like the previous example) to make it unique.

       -i|--import
	      Import exported Volume Groups.  Otherwise VGs that have been exported will not be changed (nor will their associated PVs).

ENVIRONMENT VARIABLES
       LVM_BINARY
	      The LVM2 binary to use.  Defaults to "lvm".

EXAMPLES
       The  origin VG vg00 has origin PVs /dev/sda and /dev/sdb and the respective snapshot PVs are /dev/sdc and /dev/sdd.  To rename the VG asso-
       ciated with /dev/sdc and /dev/sdd from vg00 to vg00_snap (and to change associated VG and PV UUIDs) do:

	    vgimportclone --basevgname vg00_snap /dev/sdc /dev/sdd

SEE ALSO
       lvm(8)

Red Hat, Inc.						 LVM TOOLS 2.02.95(2) (2012-03-06)					  VGIMPORTCLONE(8)