Adaptec SCSI going nuts

[Niki Denev]

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Joshua Coombs wrote:
> Just got a dual Opteron system to play with amd64 builds of FreeBSD.
> Poking around to see how it behaived, I initially tossed FreeBSD 4.11 on
> it, and was surprised to see a dump of the scsi controller state at the
> end of the dmesg.  Tried 6.0-Rel, both x86 and amd64, same behavior. 
> Bumped up to 6-stable from yesterday, same behavior.  After the dump,
> the system appears solid, no other errors, so I'm guessing it's just a
> problem with how the card is initialized, FreeBSD corrects it and moves on.
> 
> Should I be more concerned, or consider it a quirk of the machine?
> 
> Joshua Coombs
> 
[...]

I was seeing similar stuff on one machine.
I solved the problem with forcing the scsi controller to U160,
and splitting the disks on the both channels to distribute the load.
(mine was dual-channel onboard U320 and four Seagate 36G 10Krpm hdds)
I've heard that this has something to do with firmware incompatibility on
some Seagate SCSI drives and Adaptec U320 controllers, but i don't know if
it's true.
I haven't found stability issues before and after this change, but i left
it at U160 to get rid of these messages.

Niki
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