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Old 11-02-2009, 04:55 AM   #1
Registered: Jun 2006
Location: Ontario, Canada
Distribution: Debian
Posts: 448

Rep: Reputation: 35
restore LVM VG after PV device names changed

I have 2 LVM PV partitions, on 2 disks(1 PV each), which make up a single LV and single VG.

I recently added a PCI disk controller so I could add another SATA disk.

The problem is that when I add the PCI controller card, it takes precedence over the on-board controller and my usual sda and sdb drives become sdb and sdc when there is a drive attached to the PCI card. This results in my PVs not being found on boot and my VG not being setup or mounted.

I gather that it should be quite a simple task to get LVM to re-find my PVs and restore the LV/VG to working order, but try as I might, I can't find the exact info I'm looking for. It's all about restoring failing drives or multipath or another of the myriad configuration options available through LVM and I'm totally uncertain if I have my answer or not.

I really don't want to proceed without being sure, so can someone confirm for me that this...
vgchange -a y all I need to do to get my VG working again after a device name mix-up?

edit: after changing my fstab to point to UUIDs for the non-lvm partitions on my sda and sdb drives, LVM seems to find my VG properly now without any interaction from me.

Last edited by lurko; 11-02-2009 at 07:34 AM.
Old 11-13-2009, 08:11 AM   #2
Registered: Sep 2009
Distribution: Fedora, Red Hat
Posts: 52

Rep: Reputation: 18
hmm... even if the pv names change, lvm should still see your volume groups (after vgscan or reboot).


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