From owner-freebsd-questions Wed Mar 6 19: 5:16 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mail5.nc.rr.com (fe5.southeast.rr.com [24.93.67.52]) by hub.freebsd.org (Postfix) with ESMTP id 2F01F37B404 for ; Wed, 6 Mar 2002 19:04:58 -0800 (PST) Received: from i8k.babbleon.org ([66.57.85.154]) by mail5.nc.rr.com with Microsoft SMTPSVC(5.5.1877.687.68); Wed, 6 Mar 2002 22:04:57 -0500 Received: by i8k.babbleon.org (Postfix, from userid 111) id 19E24BA03; Wed, 6 Mar 2002 22:04:46 -0500 (EST) Content-Type: text/plain; charset="iso-8859-1" From: Brian T.Schellenberger To: Cliff Sarginson , questions@FreeBSD.ORG Subject: Re: Softupdates on root in 4.5-RELEASE Date: Wed, 6 Mar 2002 22:04:45 -0500 X-Mailer: KMail [version 1.3] References: <47615415@toto.iv> <20020306144816.C2BBFBA03@i8k.babbleon.org> <20020306145517.GE4280@raggedclown.net> In-Reply-To: <20020306145517.GE4280@raggedclown.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-Id: <20020307030446.19E24BA03@i8k.babbleon.org> 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 On Wednesday 06 March 2002 09:55 am, Cliff Sarginson wrote: | On Wed, Mar 06, 2002 at 09:48:16AM -0500, Brian T. Schellenberger wrote: | > On Wednesday 06 March 2002 09:35 am, Cliff Sarginson wrote: | > | On Wed, Mar 06, 2002 at 03:19:26AM -0600, Mike Meyer wrote: | > | > I personally make the root partitoin larger, enable soft updates, and | > | > use SCSI disks with proper tagged queuing support so the write cache | > | > isn't a problem. | > | | > | Can you clarify this a bit. | > | With a SCSI disk, tagged queuing etc, soft-updates are not helpful ? | > | yes or no ? | > | > No. That is, they ARE helpful. | > | > But with tagged queuing on a SCSI disk, write caching isn't dangerous, so | > there's no reason not to use it. | > | > With an IDE disk, write caching IS dangerous. | > | > Another advantage of SCSI. | | Ok, so currently this BSD system runs off SCSI with soft-updates on | everything, except root. | | Would you recommend that optimal performance would be achieved, without | danger, by enabling write-caching as well ? Yes, if you have tagged queuing. Check your messages (dmeg). | And what would you recommend therefore with root, which has neither | enabled at the moment ? Provided it's reasonably large (say, over 100M). But you can't enable/disable write-caching on a per-partition basis anyway. -- Brian T. Schellenberger . . . . . . . bts@wnt.sas.com (work) Brian, the man from Babble-On . . . . bts@babbleon.org (personal) ME --> http://www.babbleon.org http://www.eff.org <-- GOOD GUYS --> http://www.programming-freedom.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message