From owner-freebsd-scsi Wed Jul 14 14:55:44 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id 6A93814FCB for ; Wed, 14 Jul 1999 14:55:33 -0700 (PDT) (envelope-from ken@panzer.kdm.org) Received: (from ken@localhost) by panzer.kdm.org (8.9.3/8.9.1) id PAA41027; Wed, 14 Jul 1999 15:54:49 -0600 (MDT) (envelope-from ken) Message-Id: <199907142154.PAA41027@panzer.kdm.org> Subject: Re: Question In-Reply-To: <199907142146.OAA16274@saffron.CS.Berkeley.EDU> from Nisha Talagala at "Jul 14, 1999 02:46:35 pm" To: nisha@CS.Berkeley.EDU (Nisha Talagala) Date: Wed, 14 Jul 1999 15:54:49 -0600 (MDT) Cc: scsi@FreeBSD.ORG From: "Kenneth D. Merry" X-Mailer: ELM [version 2.4ME+ PL54 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Nisha Talagala wrote... > > I have a Quantum Atlas disk drive that appears to > be doing some form of delayed write optimization. > Is there any OS command or mode page change that can > turn it off? You mean write caching? To disable write caching, change the WCE (write cache enable) bit on mode page 8 from 1 to 0. To edit mode page 8 for da1, you'd do: camcontrol modepage -n da -u 1 -m 8 -e -P 3 Ken -- Kenneth Merry ken@plutotech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message