From owner-freebsd-fs@FreeBSD.ORG Fri Sep 2 15:07:41 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A8CE2106564A for ; Fri, 2 Sep 2011 15:07:41 +0000 (UTC) (envelope-from trent@snakebite.org) Received: from exchange.liveoffice.com (exchla3.liveoffice.com [64.70.67.188]) by mx1.freebsd.org (Postfix) with ESMTP id 8D2D08FC08 for ; Fri, 2 Sep 2011 15:07:41 +0000 (UTC) Received: from EXCASUM02.exchhosting.com (192.168.11.116) by exhub04.exchhosting.com (192.168.11.100) with Microsoft SMTP Server (TLS) id 8.2.213.0; Fri, 2 Sep 2011 08:07:38 -0700 Received: from [10.211.55.3] (35.11.55.172) by exchange.liveoffice.com (192.168.11.116) with Microsoft SMTP Server (TLS) id 8.2.213.0; Fri, 2 Sep 2011 08:07:38 -0700 Message-ID: <4E60F138.1000705@snakebite.org> Date: Fri, 2 Sep 2011 11:07:36 -0400 From: Trent Nelson User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0 MIME-Version: 1.0 To: References: <4E5F811A.2040307@snakebite.org> <7FAD4A4D-2465-4A80-A445-1D34424F8BB6@3geeks.org> <4E5FBE3E.7020706@snakebite.org> <553883C7-B97D-429F-AF4A-E208B6051B62@3geeks.org> In-Reply-To: <553883C7-B97D-429F-AF4A-E208B6051B62@3geeks.org> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: gptzfsboot and 4k sector raidz X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Sep 2011 15:07:41 -0000 On 01-Sep-11 1:46 PM, Daniel Mayfield wrote: >> Enough about sizes; what's your read/write performance like between >> 512-byte/4K? I didn't think to test performance in the 4K >> configuration; I really wish I had, now. > > I didn't test performance. I'm doing all the work running from the > mfsBSD boot disc. I'm not sure a simple 'dd' is a good test, but if > you have suggestions, I'm open. It's a good test when it shows you can't get more than 20-30MB/sec in bursts for each disk ;-) I didn't think to try just dd'ing directly to the disk versus through a zfs pool; I think the results of that would be pretty conclusive with regards to whether or not using the new 4K-sector drives with 512-byte sectors is as bad as I'm seeing, or if it's something else. Trent.