Why are my LVM volumes missing after creating a partition table?

Solution Verified - Updated -

Issue

  • Why are my LVM volumes missing after creating a partition table?
  • My LVM Physical Volumes (PVs), Volume Groups (VGs), and Logical Volumes (LVs) cannot be found.
  • One physical volume /dev/sdX is listed as "unknown device" even though it appears in /proc/partions:
# lvs -a -o +devices
  Couldn't find device with uuid aaaaaa-bbbb-cccc-dddd-eeee-ffff-gggggg.
  LV                 VG        Attr   LSize  Origin Snap%  Move Log Copy%  Convert Devices             
  lv_root            localvg00 -wi-ao  4.00G                                       /dev/sda2(512)      
  lv_data            localvg00 -wi-ao 40.00G                                       unknown device(0)    <----

# grep sdX /proc/partitions 
   8    16   49283072 sdX
   8    17   49283040 sdX1
  • I get the following error when trying to restore LVM metadata on a Physical Volume:
Can't open /dev/sdX exclusively. Mounted filesystem?

Environment

  • Red Hat Enterprise Linux
  • LVM2 Logical Volume Manager

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