[linux-lvm] vgexport/vgimport fails

[Richard Ray <rray mstc state ms us>]

I've run Fedora 2 for some time.
I have /dev/mapper/vg00-lvol0 460G  448G   12G  98% /src.
I installed Fedora 4 on a different partition.
In Fedora 2 I run
umount /src
vgchange -a n vg00
vgexport vg00
all run ok.
I reboot to Fedora 4.
I run
[~]$ pvscan -v
    Wiping cache of LVM-capable devices
    Wiping internal VG cache
    Walking through all physical volumes
  No matching physical volumes found

In /var/log/messages I see where the drives in the volume group are found.

Any suggestion?

Richard