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Date: Wed, 06 Aug 2003 08:51:31 -0600
From: "Justin T. Gibbs" <gibbs@scsiguy.com>
To: Don Bowman <don@sandvine.com>,
	"'freebsd-scsi@freebsd.org'" <freebsd-scsi@freebsd.org>,
	"'aic7xxx@freebsd.org'" <aic7xxx@freebsd.org>
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Subject: Re: Ongoing U320 AIC7902 Seagate ST318453LW issues, SCB timed out
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> On some systems I am sometimes getting this error pop out.
> It seems to track the system for some reason. This is
> not a bad cable, signals look good on oscope.
> 
> Drive is: SEAGATE ST318453LW, FW 0005

You seem to have found another way to trip up the Seagate drives.
According to the controller, there are 13 commands that are outstanding
on the drive that have not been completed within the timeout period.
The bus is idle and so is the controller.

The SCB count in this dump is 64.  Are you not throttling the number
of commands to 32 for these devices?  If so, the SCB count should not
be higher than 32 for a single drive configuration.  I have seen behavior
similar to what you are experiencing with tag depths greater than 32.

--
Justin