ahd0: Invalid Sequencer interrupt occurred.

[Niki Denev]

Ricardo A. Reis wrote:
> Hi all,
> 
> The University where i work recent  acquire a new server, i install
> FreeBSD 6.0 and update for STABLE yestarday,
> in dmesg i see this messages""
> 
> 
> ahd0: Invalid Sequencer interrupt occurred.
> 
> 

I've had similar problems with Dual channel U320 adaptec
controller (built in on supermicro board) and Seagate U320 drives.
The solution was to force the drives to U160 speed from the BIOS,
and split the drives equaly on the two channels to reduce the bottleneck.

--niki