From owner-freebsd-questions Mon Sep 17 22:39: 5 2001 Delivered-To: freebsd-questions@freebsd.org Received: from guru.mired.org (okc-94-248-46.mmcable.com [24.94.248.46]) by hub.freebsd.org (Postfix) with SMTP id 22FB037B40C for ; Mon, 17 Sep 2001 22:39:01 -0700 (PDT) Received: (qmail 86879 invoked by uid 100); 18 Sep 2001 05:38:59 -0000 From: Mike Meyer MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15270.56819.636304.261065@guru.mired.org> Date: Tue, 18 Sep 2001 00:38:59 -0500 To: Brian T.Schellenberger Cc: questions@freebsd.org Subject: Re: soft updates In-Reply-To: <89370727@toto.iv> X-Mailer: VM 6.90 under 21.1 (patch 14) "Cuyahoga Valley" XEmacs Lucid X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`;h9L,Yg`+vb1>RG% *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\ Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Brian T.Schellenberger types: > On Sunday 16 September 2001 20:53, Nathan Mace wrote: > > basically what i'm asking is is it stable? and how much of a performance > > gain am i gonna see? thanks > > "Yes," and "a lot", respectively, but you *must* turn off write-cache on your > disk if you are going to use soft updates. Only for IDE drives. SCSI provides features that let you use write-cache safely - if the driver you are using supports the feature. Check the driver manual page for "tagged queuing". If the driver supports that, you can turn write caching on for the SCSI drives attached to it. IDE disks that support tagged queuing are coming and the ATA driver supports them, but the most recent report I have says they aren't very reliable. http://www.mired.org/home/mwm/ Q: How do you make the gods laugh? A: Tell them your plans. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message