SUN Fire V245 internal disk upgrade - Help Needed.

Hello Sun Managers,
 
I have a Single Sun V245 Server with four internal disks
(73G * 4) , Need to upgrade the disks by replacing them to a 146G disks, the
server does not have DVD ROM, and wanted to check what is the best way to
accomplish this ? 
Below is the configuration details :
 
bash-3.00# raidctl
Controller: 0
        Volume:c0t2d0
        Disk: 0.0.0
        Disk: 0.1.0
        Disk: 0.2.0
        Disk: 0.3.0

Format :
 
bash-3.00# format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
       0. c0t0d0 <SUN72G
cyl 14087 alt 2 hd 24 sec 424>
         
/pci@1e,600000/pci@0/pci@a/pci@0/pci@8/scsi@1/sd@0,0
       1. c0t1d0 <SUN72G
cyl 14087 alt 2 hd 24 sec 424>
         
/pci@1e,600000/pci@0/pci@a/pci@0/pci@8/scsi@1/sd@1,0
       2. c0t2d0
<LSILOGIC-LogicalVolume-3000 cyl 65533 alt 2 hd 16 sec 273>  embcc01
         
/pci@1e,600000/pci@0/pci@a/pci@0/pci@8/scsi@1/sd@2,0

Pls do let me know what
are my options, the Traget 2 (c0t2d0) has data and we need to move the data
when the disk upgrades 
 
Regards,
Dinesh