LVM problem: f*cked up LVM metadata

[realBigMac]

My fileserver stored it's data on 3 physical disks,building a volumegroup with lvm2.
The mashine was running dapper drake for a long time without any problems but I decided to switch to feisty fawn. Switching from debian to dapper drake I installed and removed quite a lot of packages, leaving a messy system, so I thought a new and clean installation with feisty fawn might be a great idea.

box config with dapper drake:

hda: 120GB (PATA) systemdisk
hdb: unused
hdc: 250GB (PATA) part of the LVM-array
hdd: 250GB (PATA) part of the LVM-array
sda: 400GB (SATA) part of the LVM-array
sdb: DVD-RW (PATA on additional PCI-controller UDMA-100)

The additional IDE-controller was installed to be able to install even more disks, but as I won't buy any new PATA stuff the controller was dispensable.

new box config:

hda: 120GB (PATA) systemdisk
hdb: DVD-RW
hdc: 250GB (PATA) part of the LVM-array
hdd: 250GB (PATA) part of the LVM-array
sda: 400GB (SATA) part of the LVM-array

I exported the vg before shutting down dapper drake and while installing festy fawn to the box I - no idea what did me do so - installed grub to hdc. Ooops, this disk was part of the LVM array and so grub f*cked up the lvm meta-data on hdc.

After installing grub to hda the box is running fine, despite the LVM which can't find one of the vgs volumes:

bigmac@knecht:~$ sudo pvscan
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  PV /dev/hdd         VG vgdata   lvm2 [232.88 GB / 0    free]
  PV unknown device   VG vgdata   lvm2 [232.88 GB / 0    free]
  PV /dev/sda         VG vgdata   lvm2 [372.61 GB / 4.00 MB free]
  Total: 3 [838.38 GB] / in use: 3 [838.38 GB] / in no VG: 0 [0   ]

bigmac@knecht:~$ sudo pvdisplay
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  --- Physical volume ---
  PV Name               /dev/hdd
  VG Name               vgdata
  PV Size               232.88 GB / not usable 0   
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              59618
  Free PE               0
  Allocated PE          59618
  PV UUID               locW5S-HNFK-b1WW-iOLt-olHl-2SNd-fmXKC8
   
  --- Physical volume ---
  PV Name               unknown device
  VG Name               vgdata
  PV Size               232.88 GB / not usable 0   
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              59618
  Free PE               0
  Allocated PE          59618
  PV UUID               9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81
   
  --- Physical volume ---
  PV Name               /dev/sda
  VG Name               vgdata
  PV Size               372.61 GB / not usable 0   
  Allocatable           yes 
  PE Size (KByte)       4096
  Total PE              95388
  Free PE               1
  Allocated PE          95387
  PV UUID               YUJcsF-3XP7-OrbO-pITp-5z96-gw1A-DI11QS

   
bigmac@knecht:~$ sudo vgscan
  Reading all physical volumes.  This may take a while...
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find all physical volumes for volume group vgdata.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find all physical volumes for volume group vgdata.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find all physical volumes for volume group vgdata.
  Couldn't find device with uuid '9kpWwu-LdwT-YiqV-DRPg-kSAN-plYN-v1Eq81'.
  Couldn't find all physical volumes for volume group vgdata.
  Volume group "vgdata" not found

I tried multiple Live-CDs like gparted (with testdisk), Ultimate Boot-CD and SystemRescueCd, but none could help.

Any idea what to do to get the lvm up and running?
How to restore the metadata on hdc?

Regards,

BigMac