From owner-freebsd-questions Thu Nov 29 17:48:51 2001 Delivered-To: freebsd-questions@freebsd.org Received: from guru.mired.org (okc-65-31-203-60.mmcable.com [65.31.203.60]) by hub.freebsd.org (Postfix) with SMTP id 78D4337B416 for ; Thu, 29 Nov 2001 17:48:47 -0800 (PST) Received: (qmail 32795 invoked by uid 100); 30 Nov 2001 01:48:46 -0000 From: Mike Meyer MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15366.58750.968725.377038@guru.mired.org> Date: Thu, 29 Nov 2001 19:48:46 -0600 To: Brian T.Schellenberger Cc: questions@freebsd.org Subject: Re: Softupdates In-Reply-To: <103928563@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: > Now, > softupdates on + write cache on > > is the ultimate in speed, but least safe for your data. I would have expected the ultimate in speed and danger to be async + write cache on. Have you tested that combination? > (Of course modern Linux uses a journaling filesystem, which allows > for safe write caching as long the write cache writes data > in-order.) You can't assume that about IDE write caching drives. Dillon claimed that it's possible to delay the actual write to disk on some drives indefinitely. 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