Incorrect geometry with 750G ciss array

[Kevin Day]

I've got some new HP DL185 G5 servers, using the integrated RAID  
controller. I'm having trouble finding any geometry settings that the  
7.0-RELEASE sysinstall is happy with that will result in a bootable  
system though. Any pointers from anyone who has been here before?

ciss0: <HP Smart Array E200> port 0xe800-0xe8ff mem  
0xdef80000-0xdeffffff,0xdef78000-0xdef7ffff irq 35 at device 8.0 on pci5
ciss0: [ITHREAD]
da0: 762977MB (1562578608 512 byte sectors: 255H 32S/T 65535C)

Sysinstall's partition editor comes up with 97266/255/63, but it re- 
complains that it's incorrect after every single keypress in it. If I  
push ahead anyway, I can't boot (hang after pressing F1 at the loader).

Does anyone have a volume of this size working with this controller?  
Any tricks to getting it started?

-- Kevin