Date: Sun, 09 Dec 2001 23:49:30 -0800 From: Peter Wemm <peter@wemm.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-current@FreeBSD.ORG Subject: IBM DTLA drives (was: Re: "Dangerously dedicated" yet again (was: cvs commit: src/sys/kern subr_diskmbr.c) ) Message-ID: <20011210074930.DC9DC38CC@overcee.netplex.com.au> In-Reply-To: <200112100707.fBA77rJ44369@apollo.backplane.com>
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Matthew Dillon wrote: > :> etc... So apparently my warning about these drives in 'man tuning' is > :> still appropriate :-) > :> > :> -Matt > :> > :> :> > IBM DTLA drives are known to rotate fast enough near the spindle > :> :> > that the sustained write speed exceeds the ability of the controller > :> :> > electronics to keep up, and results in crap being written to disk. > : > : > :I would adssume it actually the tracks FURTHEREST from the spindle.. > > This is the first I've heard of the alleged controller electronics > performance problem. My understanding is that the failures are due > to manufacturing problems, but people have apparently experienced > software lockups as well. > > What is not in doubt is that there have been some severe problems with > this model. Yes there are two problems. The physical failure problem seems to be mostly restricted to the 75GXP. However the electronics/bandwidth/ density/whatever-it-is problem is uniform across the entire DTLA line. We stopped using 75GXP's at work a while back, but we still regularly suffer from the electronics/bandwidth/whatever-it-is problem on 30G DTLA drives on a daily basis. Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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