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[linux-lvm] Lost Volume Group!



After upgrading a system from RedHat 9 to Scientific Linux 4 (a RedHat
EL clone) the system can no longer see my Volume Group! This isn't a
system partition but a "user" one. Also, if it's relevant it was an
'upgrade' not a new install.

pvscan gives me:
  /dev/cdrom: open failed: No medium found
  PV /dev/hda4         lvm2 [126.39 GB]
  Total: 1 [126.39 GB] / in use: 0 [0   ] / in no VG: 1 [126.39 GB]

/dev/hda4 was the only PV in volume group Volume00.

vgcfgrestore -n Volume00 /dev/hda4 gives:
  /etc/lvm/backup/hda4: stat failed: No such file or directory
  Couldn't read volume group metadata.
  Restore failed.

The file /etc/lvmtab.d/Volume00 exists, is several months old and
contains optimistic strings like: 

/dev/hda4
Volume00
/dev/Volume00/LogVol00

The directory /etc/lvm/ contains three empty subdirectories:

archive  backup  lvm.conf


Surely, if I have the Physical Volume I must be able to access the data?

Thanks in advance.

John


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