Date: Fri, 02 Oct 1998 13:23:27 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Wilko Bulte <wilko@yedi.iaf.nl> Cc: Don.Lewis@tsc.tdk.com (Don Lewis), freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810021929.NAA11650@pluto.plutotech.com> In-Reply-To: Your message of "Fri, 02 Oct 1998 14:06:50 %2B0200." <199810021206.OAA29167@yedi.iaf.nl>
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>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 UPS, write caching is not evil at all. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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