This customer lost two PVs after performing a reboot on their system. It really looks very similar to BZ#164014. This is using kernel 2.4.21-27.EL and LVM lvm-1.0.8-9-i386. It seems they didn't upgrade any package, nor change any binary files. The only action they did perform was the addition of some cluster suite scripts [we still don't know what they did/are]. Their pvscan -v output is : root(sodmfg07):/tmp >pvscan -v pvscan -- reading all physical volumes (this may take a while...) pvscan -- walking through all physical volumes found pvscan -- ACTIVE PV "/dev/sda5" of VG "vg00" [4.88 GB / 0 free] pvscan -- inactive PV "/dev/sda7" is in no VG [7.58 GB] pvscan -- ACTIVE PV "/dev/sda8" of VG "vg00" [2.80 GB / 1.23 GB free] pvscan -- ACTIVE PV "/dev/sda9" of VG "vg01" [23.25 GB / 256 MB free] pvscan -- inactive PV "/dev/sdb4" of VG "vg-gpaosan" [66.81 GB / 5.81 GB free] pvscan -- inactive PV "/dev/sdc4" of VG "vg-gpaosan" [66.81 GB / 5.81 GB free] pvscan -- total: 6 [172.24 GB] / in use: 5 [164.66 GB] / in no VG: 1 [7.58 GB] Their vgscan outputs : root(sodmfg07):/tmp >vgscan vgscan -- reading all physical volumes (this may take a while...) vgscan -- found active volume group "vg00" vgscan -- found active volume group "vg01" vgscan -- found active volume group "vg-gpaosan" vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created vgscan -- WARNING: This program does not do a VGDA backup of your volume groups We also tried to activate the PV by using pvchange -xy but without success: root(sodmfg07):/tmp >pvchange -x y /dev/sdc4 pvchange -- unable to find volume group of "/dev/sdc4" (VG not active?) pvchange -- 0 physical volumes changed / 0 physical volumes already o.k. This VG vg-gpaosan was/is set on the PVs using /dev/sdb4 and /dev/sdc4 : /dev/sdb4 scsi1 chan0 id0 lun0 /dev/sdc4 scsi2 chan0 id0 lun0 Which are in two different QLogic controllers. The Support Engineer requested the first 1Mbyte of each device and both result : root(sodmfg07):/tmp > file -s /dev/sdb4 /dev/sdb4: data root(sodmfg07):/tmp >file -d /dev/sdc4 /dev/sdc4: block special (8/36) Having both the same sha1sum output. Shall we proceed like on the comment below ? https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=164014#c13 We do have all the etc/lvmconf/ etc/lvmtab etc/lvmtab.d/ Please let us know if you need additional informations or details. thanks, jose