Date: Mon, 16 Nov 1998 15:59:25 -0800 (PST) From: Doug White <dwhite@resnet.uoregon.edu> To: Simon Karpen <slk@acm.rpi.edu> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: How do I disable Tagged Command Queue on a particular device? Message-ID: <Pine.BSF.4.03.9811161555530.17775-100000@resnet.uoregon.edu> In-Reply-To: <Pine.LNX.3.96.981113230609.297A-100000@grace.acm.rpi.edu>
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On Fri, 13 Nov 1998, Simon Karpen wrote: > I've just installed 3.0-RELEASE (my first FreeBSD install, though I've > been using SunOS, Solaris, Linux, and other Unix for several years). > > FreeBSD is on part of a Quantum Fireball ST, which is connected via > a Buslogic BT-958 SCSI HBA. I know this drive has firmware bugs that > make it unstable (command timeouts under Linux, CCB timeouts under > FreeBSD) when run with a queue depth of larger than 7. > > Under Linux I add BusLogic=QD:[10,7] to the kernel command line. > This limits the Queue depth of the fireball (target 1) to 7. I > have yet to find a similar setting/command in FreeBSD. > > So, how do I do at least one of: > disable tagged command queue globally > disable tagged command queue for that drive > limit queue depth to 7 > > I would greatly appreciate an answer, as I would like to give FreeBSD > a real try, but I can't with SCSI timeouts under any sustained heavy write > activity. Modify the SCSI system quirks table in the kernel source at /usr/src/sys/cam/cam_xpt.c and set the mintags and maxtags to 0. Also check for an updated firmware for your drive. Doug White Internet: dwhite@resnet.uoregon.edu | FreeBSD: The Power to Serve http://gladstone.uoregon.edu/~dwhite | www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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