Features CERC SATA RAID 2 PCI SATA 6ch

[Frederik]

I've got a PowerEdge 700 with the following SATA RAID controller:

0000:02:01.0 RAID bus controller: Adaptec AAC-RAID (rev 01)
	Subsystem: Dell CERC SATA RAID 2 PCI SATA 6ch (DellCorsair)
	Flags: bus master, 66MHz, slow devsel, latency 32, IRQ 177
	Memory at f4000000 (32-bit, prefetchable) [size=64M]
	Expansion ROM at fe100000 [disabled] [size=32K]
	Capabilities: <available only to root>

( 0000:02:01.0 0104: 9005:0285 (rev 01) )

This controller works fine with the Linux aacraid module, and I can use 
Adaptec's arcconf utility with it. There are currently three 120 GB disks 
attached in RAID 5.

Would it be possible to connect a fourth sata disk to this controller, 
and extend the RAID 5 array so I get 120 GB of extra capacity, of course 
without having to reinitialize the array? How would I do that in 
practice? Any pointer to documentation of this specific controller would 
be welcome.

-- 
Frederik