Date: Fri, 13 Nov 1998 23:10:48 -0500 (EST) From: Simon Karpen <slk@acm.rpi.edu> To: freebsd-questions@FreeBSD.ORG Subject: How do I disable Tagged Command Queue on a particular device? Message-ID: <Pine.LNX.3.96.981113230609.297A-100000@grace.acm.rpi.edu>
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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. -- Simon Karpen karpes@rpi.edu slk@acm.rpi.edu #include <std_disclaimer.h> I don't speak for RPI in any way. "Those that give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety." --Ben Franklin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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