Date: Sat, 3 Oct 1998 00:54:44 +0200 (CEST) From: Wilko Bulte <wilko@yedi.iaf.nl> To: gibbs@plutotech.com (Justin T. Gibbs) Cc: Don.Lewis@tsc.tdk.com, freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810022254.AAA04758@yedi.iaf.nl> In-Reply-To: <199810021929.NAA11650@pluto.plutotech.com> from "Justin T. Gibbs" at "Oct 2, 98 01:23:27 pm"
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As Justin T. Gibbs wrote... > >Yuck. Write caching on disks is evil. I've discussed this kind of > >thing at great length with the disk gurus at work. There is consensus: > >write caching is not to be trusted, there are even firmware incarnations > >out there that get confused by a SCSI bus reset and loose track of what > >they have cached. Admittedly this is junk firmware, but it seems to > >happen. > > Your statement doesn't seem to be "write caching is inherently evil", > but "there are many drives with bogus firmware where write caching is > evil". There is a big difference. If you have a sane device and a True, there is a big difference alright. But the problem is that is not easy for an average user to find out how well behaved a disk's fw actuall is. > UPS, write caching is not evil at all. Right. I for one opt for security over a (small ?) performance gain. Wilko _ ______________________________________________________________________ | / o / / _ Bulte email: wilko@yedi.iaf.nl |/|/ / / /( (_) Arnhem, The Netherlands WWW : http://www.tcja.nl ______________________________________________ Powered by FreeBSD __________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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