We need VTOK(SMI) labeled disk for boot.

Example:
# format -e
Searching for disks...done
AVAILABLE DISK SELECTIONS:
       0. c2t0d0 <SUN72G cyl 14087 alt 2 hd 24 sec 424>
          /pci@1c,600000/scsi@2/sd@0,0
       1. c2t1d0 <SUN72G cyl 14087 alt 2 hd 24 sec 424>
          /pci@1c,600000/scsi@2/sd@1,0
       2. c2t2d0 <FUJITSU-MAP3147N SUN146G-0501-136.73GB>
          /pci@1c,600000/scsi@2/sd@2,0
       3. c2t3d0 <FUJITSU-MAP3147N SUN146G-0501-136.73GB>
          /pci@1c,600000/scsi@2/sd@3,0
Specify disk (enter its number): 0
selecting c2t0d0
[disk formatted]

format> label
[0] SMI Label
[1] EFI Label
Specify Label type[0]: 0
Ready to label disk, continue? yes
 
format> partition
partition> print
<show result>
partition> modify
Select partitioning base:
        0. Current partition table (default)
        1. All Free Hog
Choose base (enter number) [0]? 1

Part      Tag    Flag     Cylinders         Size            Blocks
  0       root    wm       0                0         (0/0/0)             0
  1       swap    wu       0                0         (0/0/0)             0
  2     backup    wu       0 - 14084      136.69GB    (14085/0/0) 286657920
  3 unassigned    wm       0                0         (0/0/0)             0
  4 unassigned    wm       0                0         (0/0/0)             0
  5 unassigned    wm       0                0         (0/0/0)             0
  6        usr    wm       0                0         (0/0/0)             0
  7 unassigned    wm       0                0         (0/0/0)             0
  8       boot    wu       0 -     0        9.94MB    (1/0/0)         20352
  9 alternates    wm       0                0         (0/0/0)             0

Do you wish to continue creating a new partition
table based on above table[yes]? yes
Free Hog partition[6]? 0
Enter size of partition '1' [0b, 0c, 0.00mb, 0.00gb]: 
Enter size of partition '3' [0b, 0c, 0.00mb, 0.00gb]: 
Enter size of partition '4' [0b, 0c, 0.00mb, 0.00gb]: 
Enter size of partition '5' [0b, 0c, 0.00mb, 0.00gb]: 
Enter size of partition '6' [0b, 0c, 0.00mb, 0.00gb]: 
Enter size of partition '7' [0b, 0c, 0.00mb, 0.00gb]: 

Part      Tag    Flag     Cylinders         Size            Blocks
  0       root    wm       1 - 14084      136.68GB    (14084/0/0) 286637568
  1       swap    wu       0                0         (0/0/0)             0
  2     backup    wu       0 - 14084      136.69GB    (14085/0/0) 286657920
  3 unassigned    wm       0                0         (0/0/0)             0
  4 unassigned    wm       0                0         (0/0/0)             0
  5 unassigned    wm       0                0         (0/0/0)             0
  6        usr    wm       0                0         (0/0/0)             0
  7 unassigned    wm       0                0         (0/0/0)             0
  8       boot    wu       0 -     0        9.94MB    (1/0/0)         20352
  9 alternates    wm       0                0         (0/0/0)             0

Okay to make this the current partition table[yes]? yes
Enter table name (remember quotes): "c2t0d0" 
Ready to label disk, continue? yes
partition> quit
format> quit
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