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 retrieve and change partition’s UUID Universally Unique Identifier on linux
Viewed 1059 times since Tue, Jul 17, 2018
RHEL: Retrieve and generate a unique SCSI identifier
Viewed 1539 times since Sat, Jun 2, 2018
What Is /dev/shm And Its Practical Usage
Viewed 5708 times since Tue, Mar 12, 2019
Telnet – Send GET/HEAD HTTP Request
Viewed 1350 times since Mon, Feb 18, 2019
RHEL: Allowing users to ’su’ to "root" / Allowing ’root’ to login directly to the system using ’ssh’
Viewed 1390 times since Sat, Jun 2, 2018
RHCS6: Install a two-node basic cluster
Viewed 1407 times since Sun, Jun 3, 2018
Setup SSL Tunnel Using Stunnel on Ubuntu
Viewed 843 times since Fri, Sep 28, 2018
Securing /tmp and shm partitions
Viewed 1157 times since Fri, May 15, 2020
Configuring VLAN interfaces in Linux
Viewed 3074 times since Mon, May 21, 2018
red hat 7 tmpfiles service
Viewed 806 times since Thu, Oct 11, 2018