> but now about twice or four times a day I get
> 
> wm0: Received overrun
> 
> and the machine stop responding to pings for a ~10 seconds--it can still
> ping itself, but can't ping out.  it's light on the switch stays on.
> 
>   These might be related to lots of traffic coming through the ethernet,
> but I'm not 100% sure about this..  (sometimes it seems to happen when
> there is very little traffic goingon)

It looks to me like you may be overrunning the capacity of your PCI-X 
bus.  Everything is attached to it, and you've just added a high-speed 
disk subsystem.  Try computing the data rates of the disk plus gigabit 
Ethernet, and see if this confirms my suspicion.

	--Ed