Here is the output from addunit.log

[Sat Aug 26 22:49:40 EDT 2006] Add unit start
parameter md0 new
sector size 512 /dev/md0
1+0 records in
1+0 records out
1024 bytes transferred in 0.013320 seconds (76877 bytes/sec)
BLKRRPART: Invalid argument
[Sat Aug 26 22:49:43 EDT 2006] Add unit start
parameter md0 new

vgdisplay :

Volume group "vg0" not found
[Sat Aug 26 22:49:43 EDT 2006] DONE