Installation guide

Chapter 6. LVM Troubleshooting

indicated above, FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk. This command restores the

physical volume label with the metadata information contained in VG_00050.vg, the most recent

good archived metadata for the volume group. The restorefile argument instructs the pvcreate

command to make the new physical volume compatible with the old one on the volume group,

ensuring that the new metadata will not be placed where the old physical volume contained data

(which could happen, for example, if the original pvcreate command had used the command line

arguments that control metadata placement, or if the physical volume was originally created using a

different version of the software that used different defaults). The pvcreate command overwrites only

the LVM metadata areas and does not affect the existing data areas.

[root@link-07 backup]# pvcreate --uuid "FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk" --

restorefile /etc/lvm/archive/VG_00050.vg /dev/sdh1

Physical volume "/dev/sdh1" successfully created

You can then use the vgcfgrestore command to restore the volume group's metadata.

[root@link-07 backup]# vgcfgrestore VG

Restored volume group VG

You can now display the logical volumes.

[root@link-07 backup]# lvs -a -o +devices

LV VG Attr LSize Origin Snap% Move Log Copy% Devices

stripe VG -wi--- 300.00G /dev/sdh1 (0),/dev/sda1(0)

stripe VG -wi--- 300.00G /dev/sdh1 (34728),/dev/sdb1(0)

The following commands activate the volumes and display the active volumes.

[root@link-07 backup]# lvchange -ay /dev/VG/stripe

[root@link-07 backup]# lvs -a -o +devices

LV VG Attr LSize Origin Snap% Move Log Copy% Devices

stripe VG -wi-a- 300.00G /dev/sdh1 (0),/dev/sda1(0)

stripe VG -wi-a- 300.00G /dev/sdh1 (34728),/dev/sdb1(0)

If the on-disk LVM metadata takes as least as much space as what overrode it, this command can

recover the physical volume. If what overrode the metadata went past the metadata area, the data

on the volume may have been affected. You might be able to use the fsck command to recover that

data.

6.5. Replacing a Missing Physical Volume

If a physical volume fails or otherwise needs to be replaced, you can label a new physical volume to

replace the one that has been lost in the existing volume group by following the same procedure as

you would for recovering physical volume metadata, described in Section 6.4, “Recovering Physical

Volume Metadata”. You can use the --partial and --verbose arguments of the vgdisplay

command to display the UUIDs and sizes of any physical volumes that are no longer present. If you

wish to substitute another physical volume of the same size, you can use the pvcreate command

with the --restorefile and --uuid arguments to initialize a new device with the same UUID as

the missing physical volume. You can then use the vgcfgrestore command to restore the volume

group's metadata.