From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p66M4kTV171399 for ; Wed, 6 Jul 2011 17:04:46 -0500 Received: from greer.hardwarefreak.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 98053179C4B7 for ; Wed, 6 Jul 2011 15:04:44 -0700 (PDT) Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id ZEZJ3cixhlRJkjtK for ; Wed, 06 Jul 2011 15:04:44 -0700 (PDT) Received: from [192.168.100.53] (gffx.hardwarefreak.com [192.168.100.53]) by greer.hardwarefreak.com (Postfix) with ESMTP id 54C066C119 for ; Wed, 6 Jul 2011 17:04:44 -0500 (CDT) Message-ID: <4E14DBFA.3040302@hardwarefreak.com> Date: Wed, 06 Jul 2011 17:04:42 -0500 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: XFS internal error (memory corruption) References: <4E12A927.9020102@gmail.com> <20110705130932.GF1026@dastard> <4E1313C1.6020309@gmail.com> <20110706040403.GW1026@dastard> <20110706070756.GA25800@infradead.org> <20110706072221.GZ1026@dastard> <20110706080505.GA2354@infradead.org> In-Reply-To: <20110706080505.GA2354@infradead.org> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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: xfs@oss.sgi.com On 7/6/2011 3:05 AM, Christoph Hellwig wrote: > 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. If you're talking consumer grade gear, well, sure, as there is no such thing as a consumer hardware RAID card. In the world of branded OEM 'enterprise' gear, you can get a BBWC RAID card solution for little more than two drives. Are most XFS admins running consumer or enterprise grade gear? LSI 9260-4i w/512MB BBWC = $485 USD Intel RES2SV24024P expander = $280 USD Total = $765 USD 2 HP 146GB 10kRPM SAS drives = $520 USD. I threw in the expander as this LSI card is thoroughly limited with only 4 ports. It's also cheaper going this route than buying the sister card with 8 ports, yet with the same performance, and 12 more total ports. -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs