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...
vgscan
vgchange -a y

...is 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.

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