Date: Wed, 14 Mar 2001 15:10:10 +0100 (CET) From: Soren Schmidt <sos@freebsd.dk> To: gibbs@scsiguy.com (Justin T. Gibbs) Cc: bright@wintelcom.net (Alfred Perlstein), Helge.Oldach@de.origin-it.com (Helge Oldach), oberman@es.net, mobile@FreeBSD.ORG, stable@FreeBSD.ORG Subject: Re: Disk I/O problem in 4.3-BETA Message-ID: <200103141410.PAA29652@freebsd.dk> In-Reply-To: <200103141405.f2EE5Ks71827@aslan.scsiguy.com> from "Justin T. Gibbs" at "Mar 14, 2001 07:05:20 am"
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It seems Justin T. Gibbs wrote: > >First off, some disk caches are getting > 10megs, that's a lot > >of potnetial seeking after loosing power depending on the cache > >contents... > > I've heard that most modern drives reserve a contiguous area of the > disk the size of the cache near where the heads park to dump any > cache contents on power outage. This avoids most if not all seeking. > When the disk powers up again, the reserve track is read and the > transactions are written to the correct locations. Any disk that does > this should be safe to use with write caching enabled. I belived that as well, but after consulting with some of the disk vendors, I found out this was just wishfull thinking, almost noone does this anymore infact only one remembered a single drive that did this... -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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