DELL 6850 GHOST Imaging !!!

Can anybody please help me, How to image the DELL 6850 server with Symantec GHOST 6.0 or 7.5. I can map the necessary drives for imaging it to, but GHOST can’t see any local drives at all. I’ve 4 conventional 73Gb of scsi drives.
Is there any other freeware that we can try to image this type of server. I can image Dell 6650 but 6850 is giving hard time.