Date: Sun, 18 Nov 2001 18:23:50 +0100 From: Bernd Walter <ticso@cicely8.cicely.de> To: Matthew Jacob <mjacob@feral.com> Cc: Ian Dowse <iedowse@maths.tcd.ie>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/cam/scsi scsi_da.c Message-ID: <20011118182350.D80219@cicely8.cicely.de> In-Reply-To: <Pine.BSF.4.21.0111170953050.57260-100000@beppo> References: <200111171734.aa67312@salmon.maths.tcd.ie> <Pine.BSF.4.21.0111170953050.57260-100000@beppo>
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On Sat, Nov 17, 2001 at 09:54:14AM -0800, Matthew Jacob wrote: > > > > In message <Pine.BSF.4.21.0111170856380.6462-100000@beppo>, Matthew Jacob write > > s: > > >Do they really really hang, or does it simply take a very very long time to > > >flush out the cache on an MO? > > > > >From the PR: > > > > >>Description: > > >Fujitsu MO drives M2513A hang at various operations due to the synchronize cache > > >command (actually, after a few minutes the bus is reset and the disk can be > > >ejected). > > > > That's all the information I have - the mention of the bus resetting > > suggests that it is more than just a long delay (+ we have other > > similar quirks for Fujitsu drives). > > Hmm- rather than disable SYNC cache, maybe we ought to run up the timeout on > this command- it's only 5 minutes, which I could see as being slightly > marginal for an MO. 5 * 60s * 0.1M/s = 30M Which means the drive must be either slower than 100k/sec or have a cache bigger than 30M. I would say 5 min should be sane. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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