From owner-freebsd-fs@FreeBSD.ORG Sat Nov 6 19:00:36 2010 Return-Path: Delivered-To: fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 020C61065693; Sat, 6 Nov 2010 19:00:36 +0000 (UTC) (envelope-from mi+thunw@aldan.algebra.com) Received: from vms173013pub.verizon.net (vms173013pub.verizon.net [206.46.173.13]) by mx1.freebsd.org (Postfix) with ESMTP id D2F688FC18; Sat, 6 Nov 2010 19:00:35 +0000 (UTC) Received: from [192.168.1.9] ([unknown] [173.70.194.135]) by vms173013.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0LBH00EBK8SGD8D0@vms173013.mailsrvcs.net>; Sat, 06 Nov 2010 14:00:21 -0500 (CDT) Message-id: <4CD5A5B7.4040006@aldan.algebra.com> Date: Sat, 06 Nov 2010 15:00:07 -0400 From: "Mikhail T." User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.12) Gecko/20101027 Lightning/1.0b2 Thunderbird/3.1.6 MIME-version: 1.0 To: Julian Elischer References: <4CD04AEC.8040607@aldan.algebra.com> <4CD051A9.7090200@freebsd.org> <4CD0660E.2000102@aldan.algebra.com> <4CD06C4B.80100@freebsd.org> <4CD0895A.5030402@aldan.algebra.com> <4CD09830.3030400@freebsd.org> <4CD48F81.1080201@aldan.algebra.com> In-reply-to: <4CD48F81.1080201@aldan.algebra.com> Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: 7bit X-Mailman-Approved-At: Sat, 06 Nov 2010 19:33:18 +0000 Cc: fs@freebsd.org Subject: Re: iozone-ing an SSD (Re: Using an SSD "disk" for /) 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: Sat, 06 Nov 2010 19:00:36 -0000 On 11/5/2010 7:13 PM, Mikhail T. wrote: > The results can be found in 4 HTML files found at: > http://aldan.algebra.com/~mi/io/ (The original iozone-created Excel > files are there too.) I added some more iozone runs, as well as those of rawio. These are much fewer (as file-system parameters don't affect rawio) and easier to interpret: * It makes no difference to the SSD, whether your access is random or sequential * SSD clearly beats the HD in rawrite, although, at "only" 88Mb/sec, the results are far from the marketing... * SSD connected to plain SATA port strongly beats the same SSD connected to the fancy SAS controller (mpt) Yours, -mi