Received: from localhost (unknown [200.46.208.211]) by mail.postgresql.org (Postfix) with ESMTP id 89FC463475D for ; Fri, 3 Apr 2009 23:26:55 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.208.211]) (amavisd-maia, port 10024) with ESMTP id 74181-06 for ; Fri, 3 Apr 2009 23:26:44 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from westnet.com (westnet.com [216.187.52.2]) by mail.postgresql.org (Postfix) with ESMTP id DA04963443D for ; Fri, 3 Apr 2009 23:26:53 -0300 (ADT) Received: from westnet.com (localhost [127.0.0.1]) by westnet.com (8.14.0/8.14.0) with ESMTP id n342QobC028546; Fri, 3 Apr 2009 22:26:50 -0400 (EDT) Received: from localhost (gsmith@localhost) by westnet.com (8.14.0/8.13.2/Submit) with ESMTP id n342Qn6P028536; Fri, 3 Apr 2009 22:26:50 -0400 (EDT) X-Authentication-Warning: westnet.com: gsmith owned process doing -bs Date: Fri, 3 Apr 2009 22:26:49 -0400 (EDT) From: Greg Smith X-X-Sender: gsmith@westnet.com To: david@lang.hm cc: pgsql-performance@postgresql.org Subject: Re: Raid 10 chunksize In-Reply-To: Message-ID: References: User-Agent: Alpine 2.01 (GSO 1184 2008-12-16) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=AWL=0.000 X-Spam-Level: X-Archive-Number: 200904/93 X-Sequence-Number: 33460 On Fri, 3 Apr 2009, david@lang.hm wrote: > also note that the message from Ted was back in 2004, there has been a _lot_ > of work done on XFS in the last 4 years. Sure, I know they've made progress, which is why I didn't also bring up older ugly problems like delayed allocation issues reducing files to zero length on XFS. I thought that particular issue was pretty fundamental to the logical journal scheme XFS is based on. What's you'll get out of disk I/O at smaller than the block level is pretty unpredictable when there's a failure. -- * Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD