From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id nBEGHsJ3159428 for ; Mon, 14 Dec 2009 10:17:55 -0600 Received: from quickstep.mgras.net (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id C617514F76BD for ; Mon, 14 Dec 2009 08:18:29 -0800 (PST) Received: from quickstep.mgras.net (quickstep.mgras.net [84.245.154.74]) by cuda.sgi.com with ESMTP id E7Vi762nCzHWTngW for ; Mon, 14 Dec 2009 08:18:29 -0800 (PST) Received: from osprey.mgras.de (osprey.mgras.de [192.168.48.3]) by quickstep.mgras.net (8.13.1/8.13.0) with ESMTP id nBEGHSBq010103 for ; Mon, 14 Dec 2009 17:17:29 +0100 (CET) Received: (from news@localhost) by osprey.mgras.de (AIX5.1/8.11.6p2/8.11.0) id nBEGHSq24832 for linux-xfs@oss.sgi.com; Mon, 14 Dec 2009 17:17:28 +0100 From: Martin Spott Subject: Re: XFS and DPX files Date: Mon, 14 Dec 2009 16:17:28 +0000 (UTC) Message-ID: References: <4AEC2CF4.8040703@aol.com> <200911021205.28006@zmi.at> <200911022258.35164@zmi.at> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: linux-xfs@oss.sgi.com Michael Monnerie wrote: > Don't mix up the controller write cache vs. disk write cache. The > controller write cache should be on whenever you have a BBM installed, > because this brings real performance, while the disk write cache should > always be off in a production environment, because you will loose data > on power fail, which nobody can recognize (the controller believes the > sectors to be written already...) I've been under the impression that "modern disks" (TM), at minimum the server-type products, are supposed to re-use the remaining spin-energy for generating the required power and thus writing the content of their on-disk write cache to the disks. Cheers, Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -------------------------------------------------------------------------- _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs