Date: Fri, 23 Jun 2000 19:12:55 +0200 From: Wilko Bulte <wkb@chello.nl> To: Nick Slager <nicks@albury.net.au> Cc: Don Lewis <Don.Lewis@tsc.tdk.com>, scsi@FreeBSD.ORG Subject: Re: Invalidating pack messages Message-ID: <20000623191255.B2887@freebie.wbnet> In-Reply-To: <20000623173844.A51332@albury.net.au>; from nicks@albury.net.au on Fri, Jun 23, 2000 at 05:38:44PM %2B1000 References: <20000620172810.A84355@albury.net.au> <200006200754.AAA28201@salsa.gv.tsc.tdk.com> <20000621143609.A3012@albury.net.au> <200006220729.AAA07327@salsa.gv.tsc.tdk.com> <20000623173844.A51332@albury.net.au>
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On Fri, Jun 23, 2000 at 05:38:44PM +1000, Nick Slager wrote: > Thus spake Don Lewis (Don.Lewis@tsc.tdk.com): > > > If your seeing funny blinking lights on the drive, and you are not the only > > person having problems with this particular drive model, I would be very > > suspicious that a drive firmware bug is being tickled. The best solution > > in this case would be to obtain a better version of the firmware from the > > vendor, but lacking that you might try turning off tagged command queueing > > or just reducing the number of tagged openings. I've noticed interactions > > between tagged command queueing and write caching on Seagate drives, so you > > might try turning off write caching and leaving the number of tagged > > openings alone. You can do all this with camcontrol. > > This morning I disabled write back caching in the SCSI BIOS, and the machine > has been copying files here and there for ~7 hours now with no problems at > all. As you say the performance difference is pretty much negligible. > > I'm going to leave the machine copying and rm'ing files all weekend to make > sure this all is OK, but at this stage it appears disabling write caching has > fixed the problem (or at least worked around it). > > Thanks very much for your help. If this continues to work this drive/firmware combo deserves a quirk entry. -- Wilko Bulte http://www.freebsd.org "Do, or do not. There is no try" wilko@freebsd.org http://www.nlfug.nl Yoda - The Empire Strikes Back To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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