From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752422Ab1GFIFK (ORCPT ); Wed, 6 Jul 2011 04:05:10 -0400 Received: from 173-166-109-252-newengland.hfc.comcastbusiness.net ([173.166.109.252]:34652 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751290Ab1GFIFI (ORCPT ); Wed, 6 Jul 2011 04:05:08 -0400 Date: Wed, 6 Jul 2011 04:05:05 -0400 From: Christoph Hellwig To: Dave Chinner Cc: Christoph Hellwig , T?r?k Edwin , xfs-masters@oss.sgi.com, Linux Kernel Mailing List , xfs@oss.sgi.com Subject: Re: XFS internal error (memory corruption) Message-ID: <20110706080505.GA2354@infradead.org> References: <4E12A927.9020102@gmail.com> <20110705130932.GF1026@dastard> <4E1313C1.6020309@gmail.com> <20110706040403.GW1026@dastard> <20110706070756.GA25800@infradead.org> <20110706072221.GZ1026@dastard> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110706072221.GZ1026@dastard> User-Agent: Mutt/1.5.21 (2010-09-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 06, 2011 at 05:22:21PM +1000, Dave Chinner wrote: > Unless you have a good sized chunk of BBWC in front of your disks, > in which case internal logs are just as fast. In fact, internal logs > can are often faster in this case because an internal log on a 12 > disk RAID6 array can sink a whole log more bandwidth than an external > log on a 2-disk RAID0 mirror..... > > At least, that's what my hardware tells me. ;) Sure, a nice BBWC setup will give you good results. But it's generally much more expensive than a simple setup with a raid5 or 6 and a mirror for the log device.