LVM: Recovering Physical Volume Metadata

LVM: Recovering Physical Volume Metadata

# Tested on RHEL 5, 6 & 7

# If the volume group metadata area of a physical volume is accidentally overwritten or
# otherwise destroyed, you will get an error message indicating that the metadata area is
# incorrect, or that the system was unable to find a physical volume with a particular UUID.

   Couldn't find device with uuid 7GCY3s-1LYB-fhAF-kvu0-cCDm-9Q6m-s6xAQd.
   Couldn't find device with uuid 48rLN6-ztLy-nzqS-GM2a-9yvB-Cua5-wU826d.


# You may be able to recover the data the physical volume by writing a new metadata area
# on the physical volume specifying the same UUID as the lost metadata.

# UUID for the physical volume that was overwritten can be found in the /etc/lvm/archive
# directory. Look in the file
testvg_<00044-439430220>.vg for the last known valid
# archived LVM metadata for that volume group.


# If possible, before beginning, take a backup of F.S. existing on the Volume Group

VG=testvg

# umount F.S.

FS=""

for LV in `lvs --noheadings /dev/$VG | awk '{print$1}'`; do FS="$FS `mount | grep "$VG-$LV" | awk '{print$3}'`"; done

for FS in $FS; do umount $FS; done


# Deactivate the Volume Group

vgchange -an --partial $VG
  Partial mode. Incomplete volume groups will be activated read-only.
  0 logical volume(s) in volume group "testvg" now active



# Restore the right UUID (the lost ones) on the adequate Physical Volumes (match between disk
# and UUID can be found in valid /etc/lvm/archive/
testvg_<00044-439430220>.vg file)

pvcreate -ff --uuid "7GCY3s-1LYB-fhAF-kvu0-cCDm-9Q6m-s6xAQd" --restorefile /etc/lvm/archive/testvg_00044-439430220.vg /dev/mpath/mpath9p1
   Really INITIALIZE physical volume "/dev/mpath/mpath9p1" of volume group "testvg" [y/n]? y
      WARNING: Forcing physical volume creation on /dev/mpath/mpath9p1 of volume group "testvg"
      Physical volume "/dev/mpath/mpath9p1" successfully created


pvcreate -ff --uuid "48rLN6-ztLy-nzqS-GM2a-9yvB-Cua5-wU826d" --restorefile /etc/lvm/archive/testvg_00044-439430220.vg /dev/mpath/mpath12p1
   Really INITIALIZE physical volume "/dev/mpath/mpath12p1" of volume group "testvg" [y/n]? y
     WARNING: Forcing physical volume creation on /dev/mpath/mpath12p1 of volume group "testvg"
     Physical volume "/dev/mpath/mpath12p1" successfully created



# Restore Volume Group's metadata

vgcfgrestore $VG
   Restored volume group testvg


# Activate Logical Volumes

for LV in `l
vs --noheadings /dev/$VG | awk '{print$1}'`
do
   lvchange -ay /dev/$VG/$LV
done



# Verify that Logical Volumes are available

vgdisplay -v $VG | egrep "LV Name|LV Status"

# Check that you don't have the errors regarding the devices not found

   Couldn't find device with uuid 7GCY3s-1LYB-fhAF-kvu0-cCDm-9Q6m-s6xAQd.
   Couldn't find device with uuid 48rLN6-ztLy-nzqS-GM2a-9yvB-Cua5-wU826d.



# Mount F.S.

# If declared in /etc/fstab:
for FS in $FS; do mount $FS; done
0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
How to Configure ‘FirewallD’ in RHEL/CentOS 7 and Fedora 21
Viewed 10733 times since Wed, Oct 9, 2019
stunnel How To Encrypt Traffic to Redis with Stunnel on Ubuntu 16.04
Viewed 2320 times since Sun, Dec 6, 2020
Learn Linux System Auditing with Auditd Tool on CentOS/RHEL
Viewed 4568 times since Fri, Apr 5, 2019
Linux - How to monitor CPU usage
Viewed 6649 times since Fri, Jun 8, 2018
www.unixarena.com
Viewed 2607 times since Fri, Jul 27, 2018
RHEL: Route network packets to go out via the same interface they came in
Viewed 3326 times since Sat, Jun 2, 2018
Understanding System auditing with auditd
Viewed 10277 times since Fri, Apr 5, 2019
Build a simple RPM that packages a single file
Viewed 8786 times since Sat, Jun 2, 2018
RHEL: Extending a multipath LUN
Viewed 5315 times since Sun, May 27, 2018
debian Debian/Ubuntu Linux: Find If Installed APT Package Includes a Fix/Patch Via CVE Number
Viewed 9640 times since Sun, Sep 23, 2018