HP-UX

If you had other VGs they would have shown up...
so the last lines of vgdisplay -v vg01 would show you the used disks (look after:
--- Physical volumes --- )
But now you are a vgdsiplay guru why not try the other way:
Since ioscan produced:
disk 1 0/4/0/0.0.0 sdisk CLAIMED DEVICE HP C5447A
/dev/dsk/c3t0d0 /dev/rdsk/c3t0d0
disk 2 0/5/0/0.1.0 sdisk CLAIMED DEVICE HP C5447A
/dev/dsk/c4t1d0 /dev/rdsk/c4t1d0

You could type :
pvdisplay /dev/dsk/c3t0d0
pvdisplay /dev/dsk/c4t1d0

Is this production?

In which case you are living dangerously...

root:/ pvdisplay /dev/dsk/c3t0d0
--- Physical volumes ---
PV Name /dev/dsk/c3t0d0
PV Name /dev/dsk/c4t1d0 Alternate Link
VG Name /dev/vg01
PV Status available
Allocatable yes
VGDA 2
Cur LV 8
PE Size (Mbytes) 4
Total PE 19610
Free PE 5879
Allocated PE 13731
Stale PE 0
IO Timeout (Seconds) default
Autoswitch On

root:/ pvdisplay /dev/dsk/c4t1d0
Device file path "/dev/dsk/c4t1d0" is an alternate path
to the Physical Volume. Using Primary Link "/dev/dsk/c3t0d0".
--- Physical volumes ---
PV Name /dev/dsk/c3t0d0
PV Name /dev/dsk/c4t1d0 Alternate Link
VG Name /dev/vg01
PV Status available
Allocatable yes
VGDA 2
Cur LV 8
PE Size (Mbytes) 4
Total PE 19610
Free PE 5879
Allocated PE 13731
Stale PE 0
IO Timeout (Seconds) default
Autoswitch On

Me a "guru" in hp-ux? you are funny

Yes it's in production ....

So vg01 has only one disk...
And 8 logical volumes...

But how is it connected?

Code:

raz:/home/vbe $ ioscan -funC ext_bus
Class     I  H/W Path  Driver S/W State   H/W Type     Description
=================================================================
ext_bus   0  0/0/1/0   c720 CLAIMED     INTERFACE    SCSI C896 Fast Wide Single-Ended
ext_bus   1  0/0/1/1   c720 CLAIMED     INTERFACE    SCSI C896 Ultra Wide Single-Ended
ext_bus   2  0/0/2/0   c720 CLAIMED     INTERFACE    SCSI C875 Ultra Wide Single-Ended
ext_bus   3  0/0/2/1   c720 CLAIMED     INTERFACE    SCSI C875 Ultra Wide Single-Ended
ext_bus   4  0/7/0/0   c720 CLAIMED     INTERFACE    SCSI C875 Fast Wide Differential
ext_bus   5  0/7/0/1   c720 CLAIMED     INTERFACE    SCSI C875 Fast Wide Differential

The idea is to know if you have external scsi subsystem or are you using a SAN
we are looking for what is 0/4/0 and 0/5/0...

root:/ ioscan -funC ext_bus
Class I H/W Path Driver S/W State H/W Type Description
=================================================================
ext_bus 0 0/0/1/0 c720 CLAIMED INTERFACE SCSI C895 Ultra Wide Singld
ext_bus 1 0/0/2/0 c720 CLAIMED INTERFACE SCSI C875 Ultra Wide Singld
ext_bus 2 0/0/2/1 c720 CLAIMED INTERFACE SCSI C875 Ultra Wide Singld
ext_bus 3 0/4/0/0 c720 CLAIMED INTERFACE SCSI C875 Fast Wide Differl
ext_bus 4 0/5/0/0 c720 CLAIMED INTERFACE SCSI C875 Fast Wide Differl
ext_bus 5 0/12/0/0 c720 CLAIMED INTERFACE SCSI C875 Fast Wide Differl

Now if you did a
ioscan -u |more
at the line:
0/4/0/0 ext_bus SCSI C875 Fast Wide Differential (and 0/5/0/0...)
You would see following the attached disks addresses

Which seem to be here the same disk...
You have a external subsystem, remember CLAIMED DEVICE HP C5447A?
I think this is HP's autoraid 12H

So that means we are looking at a more than 70 GB LUN! so its not one disk but an array or mirror...

If you want to learn a little on your HPautoraid 12H : man arraydsp

# arraylog -e /dev/rdsk/c3t0d0

What is bad then is having just the single OS disk...

Cant migrate to 11i?

All the best