Thanks to all who replied, they were so many.
The answer arrived in 2 minutes.
The onboard of the E420R box has a single-ended SCSI
and the D1000 StorEdge has differential SCSI.
I reconnected the D1000 on a differential PCI SCSI on the E420R
and rebooted/reconfigured with "boot -r".
After reboot everything was in its place, the D100 was there up and
running.
Once again this is a great list, thank you everyone.
My original post:
Hello,
We've got 2 new E420R Servers. 
Each of them has a D1000 StorEdge with 4 disks inside of each D1000 box.
There are 2 internal disks in each E420R server.
I connected the D1000 box to the SCSI connector at the rear of the
mainboard
of the E420R.
However, I cannot see the 4 disks inside the D1000.
Format shows me only the 2 internal disks:
ts1:/# format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
       0. c0t0d0 <SUN18G cyl 7506 alt 2 hd 19 sec 248>
          /pci@1f,4000/scsi@3/sd@0,0
       1. c0t1d0 <SUN18G cyl 7506 alt 2 hd 19 sec 248>
          /pci@1f,4000/scsi@3/sd@1,0
Specify disk (enter its number): 0
I did :
# touch /reconfigure 
and rebooted the system, but nothing more.
The /dev/dsk directory however has device files for 3 disks:
c0t0d0,  c0t1d0 and  c0t6d0 instead of 6 disks (2 internal and 4
external
inside the D1000).
ts1:/# ls -lap /dev/dsk
total 58
drwxrwxr-x   2 root     sys          512 Aug 27 14:26 ./
drwxrwxr-x  19 root     sys         3584 Aug 29 08:58 ../
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s0 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:a
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s1 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:b
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s2 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:c
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s3 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:d
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s4 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:e
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s5 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:f
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s6 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:g
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t0d0s7 ->
../../devices/pci@1f,4000/scsi@3/sd@0,0:h
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s0 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:a
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s1 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:b
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s2 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:c
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s3 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:d
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s4 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:e
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s5 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:f
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s6 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:g
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t1d0s7 ->
../../devices/pci@1f,4000/scsi@3/sd@1,0:h
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s0 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:a
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s1 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:b
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s2 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:c
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s3 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:d
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s4 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:e
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s5 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:f
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s6 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:g
lrwxrwxrwx   1 root     root          41 Aug 27 14:26 c0t6d0s7 ->
../../devices/pci@1f,4000/scsi@3/sd@6,0:h
Thanks,
Constatin
S
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