>> What's the output of "disklabel -r rz2" ?
>
> disklabel: no disk label
>

Well, then try "disklabel rz2" (w/o -r).  Kernel will build fictitious
disklabel inquring SCSI parameters to the SCSI disk drive.
With an afresh disk, disklabel will show like as;

# /sbin/disklabel sd1
# /dev/rsd1c:
type: SCSI
disk: ST32430N
label: fictitious
flags:
bytes/sector: 512
sectors/track: 116
tracks/cylinder: 9
sectors/cylinder: 1044
cylinders: 3992
total sectors: 4193415
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # milliseconds
track-to-track seek: 0  # milliseconds
drivedata: 0 

1 partitions:
#        size   offset    fstype   [fsize bsize   cpg]
  a: 536870911        0      unused        0     0         # (Cyl.    0 - 514244*)
disklabel: boot block size 0
disklabel: super block size 0
disklabel: partition a: partition extends past end of unit
disklabel: warning, unused partition c: size 4193415 offset 0

Where, A partition above (line begin with "a:") is incorrect.  Adjust it;

	c: 4193415	0 	4.2BSD	1024	8192
           ~~~~~~~

Tohru Nishimura
Information Technology Centre
Nara Institute of Science and Technology