Basically I suspect that the udev events that are supposed to be getting
triggered duing the boot process in the initramfs are not getting
triggered, hence a vgscan is never done.  My guess is based on the
contents of :

[EMAIL PROTECTED]:/etc/udev/rules.d$ cat 85-lvm2.rules
# This file causes block devices with LVM signatures to be automatically
# added to their volume group.
# See udev(8) for syntax

SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="lvm*|LVM*", \
        RUN+="watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange -a y'"


here's the output of pvdisplay

[EMAIL PROTECTED]:/etc/udev/rules.d# pvdisplay
  --- Physical volume ---
  PV Name               /dev/md0
  VG Name               vg0
  PV Size               362,49 GB / not usable 1,25 MB
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              92797
  Free PE               0
  Allocated PE          92797
  PV UUID               OoPCI9-1Lj3-0eU7-3dbE-dLIz-0AKz-sjcJMz

  --- Physical volume ---
  PV Name               /dev/md1
  VG Name               vg0
  PV Size               9,54 GB / not usable 1,81 MB
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              2443
  Free PE               0
  Allocated PE          2443
  PV UUID               5SndoF-iOPs-kGpy-WQzl-S0BJ-wydK-PSaOC6

-- 
System with LVM root filesystem won't boot
https://bugs.launchpad.net/bugs/147216
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