Problem : The filesystem was corrupted and the LVM volumes could not be mounted, with the lvm partitions are lost.
Metadata backups and archives are automatically created on every volume group and logical volume configuration change unless disabled in the lvm.conf file. By default, the metadata backup is stored in the /etc/lvm/backup file and the metadata archives are stored in the /etc/lvm/archive file. If the physical volume meta data has become corrupted, missing, or severely damaged, then LVM will consider that disk as an “unknown device” and ignore it. The below procedure can be used to rebuild lvm from the archive. Before proceeding with the action plan, please take a backup of directory /etc/lvm.
# cp -pr /etc/lvm /etc/lvm_bkp
1. First find the backed up configurations of Volume Group (vg1 in this case)
# vgcfgrestore --list vg1 File: /etc/lvm/archive/vg1_00000-1238318622.vg VG name: vg1 Description: Created *before* executing 'vgcreate vg1 /dev/sda6' Backup Time: Mon Feb 29 10:58:51 2016 File: /etc/lvm/archive/vg1_00001-285796155.vg VG name: vg1 Description: Created *before* executing 'lvcreate -L 1G -n lv2 vg1' Backup Time: Mon Feb 29 10:59:23 2016 File: /etc/lvm/archive/vg1_00002-1661997476.vg ---> just before removal of volume (this is the archive we need) VG name: vg1 Description: Created *before* executing 'lvremove /dev/vg1/lv2' Backup Time: Mon Feb 29 13:55:08 2016 File: /etc/lvm/backup/vg1 VG name: vg1 Description: Created *after* executing 'lvremove /dev/vg1/lv2' Backup Time: Mon Feb 29 13:55:08 2016
2. Create partition (Ex: /dev/sdb1 ). Recovering Physical Volume Metadata, Use the –uuid and –restorefile arguments of the pvcreate command to restore the physical volume.
# pvcreate --uuid "6OZVZF-2CPS-Fo0r-hHsy-EFwN-LFMm-7LwJjK" --restorefile /etc/lvm/archive/vg1_00002-1661997476.vg /dev/sdb1
3. Recover the LVM partition using vgcfgrestore and archive file and verify.
# vgcfgrestore -f /etc/lvm/archive/vg1_00002-1661997476.vg vg1 Restored volume group vg1
# vgdisplay VG1
4. Activate the Volume Group.
# vgchange -ay VG1
5. Display the logical volumes
# lvs -a -o +devices
6. The following commands activate the volumes and display the active volumes.
# lvscan inactive '/dev/vg1/lv2' [1.00 GiB] inherit ### its in inactive state and make it active to use. ACTIVE '/dev/vg0/lv1' [1.00 GiB] inherit
# lvchange -a y /dev/vg1/lv2
7. Verify the lvm status
# lvs -a -o +devices
# lvscan ACTIVE '/dev/vg1/lv2' [1.00 GiB] inherit ACTIVE '/dev/vg0/lv1' [1.00 GiB] inherit
8. Mount LVM and verify the mount access and data available.
# mount /dev/vg1/lv2 /lv2
# df -h /lv2 Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg1-lv2 976M 1.3M 924M 1% /lv2