From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id C31747F52 for ; Fri, 22 Nov 2013 03:23:28 -0600 (CST) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay2.corp.sgi.com (Postfix) with ESMTP id 980D5304053 for ; Fri, 22 Nov 2013 01:23:28 -0800 (PST) Received: from bombadil.infradead.org ([198.137.202.9]) by cuda.sgi.com with ESMTP id ANjYpR1HQ5eLVzPn (version=TLSv1 cipher=AES256-SHA bits=256 verify=NO) for ; Fri, 22 Nov 2013 01:23:27 -0800 (PST) Date: Fri, 22 Nov 2013 01:23:25 -0800 From: Christoph Hellwig Subject: Re: Filesystem writes on RAID5 too slow Message-ID: <20131122092325.GA8512@infradead.org> References: <528A5C45.4080906@redhat.com> <20131119005740.GY6188@dastard> <20131121092606.GU11434@dastard> MIME-Version: 1.0 Content-Disposition: inline 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 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Martin Boutin Cc: Eric Sandeen , xfs-oss On Thu, Nov 21, 2013 at 11:35:14AM -0500, Martin Boutin wrote: > Sorry for the spam but I just noticed that the XFS stripe unit does not > match the strip unit of the underlying RAID device. I tried to do a > mkfs.xfs with a stripe of 512KiB but mkfs.xfs complains that the > maximum stripe width is 256KiB. Yeah. Btw, I've generally seen best results using 32k stripes, but that should only matter for log intensive loads and not simple writes. Similarly your 32mb log seems awfully small, but not really relevant for this workload. _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs