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 o2Q67S44201724 for ; Fri, 26 Mar 2010 01:07:28 -0500 Received: from greer.hardwarefreak.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id E6F871BC719D for ; Thu, 25 Mar 2010 23:09:10 -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 CddRv2uUGzsV0Wq3 for ; Thu, 25 Mar 2010 23:09:10 -0700 (PDT) Received: from [192.168.100.53] (gffx.hardwarefreak.com [192.168.100.53]) by greer.hardwarefreak.com (Postfix) with ESMTP id 8ABC86C3ED for ; Fri, 26 Mar 2010 01:09:09 -0500 (CDT) Message-ID: <4BAC4F84.9010005@hardwarefreak.com> Date: Fri, 26 Mar 2010 01:09:08 -0500 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: 128TB filesystem limit? References: <20100325235433.GM3335@dastard> <20100326003511.GN3335@dastard> <4BAC3990.30403@sandeen.net> In-Reply-To: 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 david@lang.hm put forth on 3/25/2010 11:56 PM: >>> the next fun thing is figuring out what sort of stride, etc parameters I >>> should have used for this filesystem. >> >> mkfs.xfs should suss that out for you automatically based on talking >> to md; >> of course you'd want to configure md to line up well with the hardware >> alignment. > > in this case md thinks it's working with 10 12.8TB drives, I really > doubt that it's going to do the right thing. > > I'm not exactly sure what the right thing is in this case. the hardware > raid is useing 64K chunks across 16 drives (so 14 * 64K worth of data > per stripe), but there are 10 of these stripes before you get back to > hitting the same drive again. It would be helpful if you told us the primary application(s) that will be writing to this large multi-level RAID setup. Primarily large files or small? Database? ?? -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs