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