From owner-freebsd-stable@FreeBSD.ORG Thu Jan 29 15:48:36 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 405C11065670 for ; Thu, 29 Jan 2009 15:48:36 +0000 (UTC) (envelope-from peter@simons-rock.edu) Received: from hedwig.simons-rock.edu (hedwig.simons-rock.edu [208.81.88.14]) by mx1.freebsd.org (Postfix) with ESMTP id 1640B8FC23 for ; Thu, 29 Jan 2009 15:48:35 +0000 (UTC) (envelope-from peter@simons-rock.edu) Received: from cesium.hyperfine.info (c2.8d.5646.static.theplanet.com [70.86.141.194]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by hedwig.simons-rock.edu (Postfix) with ESMTP id BBF032BB34D; Thu, 29 Jan 2009 10:48:34 -0500 (EST) Date: Thu, 29 Jan 2009 10:48:28 -0500 From: "Peter C. Lai" To: Richard Tector Message-ID: <20090129154828.GC63236@cesium.hyperfine.info> References: <49819672.1090208@thekeelecentre.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49819672.1090208@thekeelecentre.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Charles Sprickman , freebsd-stable@freebsd.org Subject: Re: 7.1, mpt and slow writes X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Jan 2009 15:48:37 -0000 On 2009-01-29 11:43:46AM +0000, Richard Tector wrote: > Charles Sprickman wrote: >> Hello, >> >> I think this needs a few more eyes: >> >> http://lists.freebsd.org/pipermail/freebsd-scsi/2009-January/003782.html >> >> In short, writes are slow, likely do to the write-cache being enabled on >> the controller. The sysctl used in 6.x to turn the cache off don't seem >> to be in 7.x. > I am guessing this is only related to SATA drives on SAS controllers? The only mpt hardware I have is LSILogic 1030 Ultra4 and it writes sustained 40MB/s to my LTO-2 drives out of the box without any tweaking. -- =========================================================== Peter C. Lai | Bard College at Simon's Rock Systems Administrator | 84 Alford Rd. Information Technology Svcs. | Gt. Barrington, MA 01230 USA peter AT simons-rock.edu | (413) 528-7428 ===========================================================