[linux-lvm] Recovering a volume after OS upgrade (lost /etc/lvm*)

[Lars Kellogg-Stedman]

I just upgraded a system to RedHat 7.2 (+ XFS from SGI) (lvm-1.0.1RC4),
and I'm trying to mount a LVM-based logical volume created using LVM
0.9mumble.  The volume group consisted of a single PV on opt of a
software RAID5 device.

pvscan says:

  pvscan -- reading all physical volumes (this may take a while...)
  pvscan -- WARNING: physical volume "/dev/sda" belongs to a meta
device
  pvscan -- inactive PV "/dev/md0"  is associated to an unknown VG (run
vgscan)
  pvscan -- total: 2 [8.48 GB] / in use: 2 [8.48 GB] / in no VG: 0 [0]

And pvdisplay says:

  --- Physical volume ---
  PV Name               /dev/md0
  VG Name               vg0
  PV Size               8.48 GB / NOT usable 2.75 MB [LVM: 129.00 KB]
  PV#                   1
  PV Status             NOT available
  Allocatable           yes (but full)
  Cur LV                1
  PE Size (KByte)       4096
  Total PE              2169
  Free PE               0
  Allocated PE          2169
  PV UUID               HHv1Tm-79Hx-uk4m-caqb-QUA5-8WGF-0yUe4Q

Which looks great.  But I can't for the life of me figure out how to
turn this back into a valid volume group.  Vgscan doesn't pick up this
device:

  vgscan -- reading all physical volumes (this may take a while...)
  vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
  vgscan -- WARNING: This program does not do a VGDA backup of your
volume group

How do I recover this volume?

Thanks,

-- Lars


=====
lars at larsshack.org

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