From owner-freebsd-hackers@FreeBSD.ORG Fri Oct 28 09:49:15 2005 Return-Path: X-Original-To: hackers@freebsd.org Delivered-To: freebsd-hackers@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A12E916A41F; Fri, 28 Oct 2005 09:49:15 +0000 (GMT) (envelope-from PeterJeremy@optushome.com.au) Received: from mail11.syd.optusnet.com.au (mail11.syd.optusnet.com.au [211.29.132.192]) by mx1.FreeBSD.org (Postfix) with ESMTP id DE12043D5D; Fri, 28 Oct 2005 09:49:13 +0000 (GMT) (envelope-from PeterJeremy@optushome.com.au) Received: from cirb503493.alcatel.com.au (c220-239-19-236.belrs4.nsw.optusnet.com.au [220.239.19.236]) by mail11.syd.optusnet.com.au (8.12.11/8.12.11) with ESMTP id j9S9mjrv020513 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Fri, 28 Oct 2005 19:48:51 +1000 Received: from cirb503493.alcatel.com.au (localhost.alcatel.com.au [127.0.0.1]) by cirb503493.alcatel.com.au (8.12.10/8.12.10) with ESMTP id j9S9miHh050120; Fri, 28 Oct 2005 19:48:44 +1000 (EST) (envelope-from pjeremy@cirb503493.alcatel.com.au) Received: (from pjeremy@localhost) by cirb503493.alcatel.com.au (8.12.10/8.12.9/Submit) id j9S9mikL050119; Fri, 28 Oct 2005 19:48:44 +1000 (EST) (envelope-from pjeremy) Date: Fri, 28 Oct 2005 19:48:44 +1000 From: Peter Jeremy To: "Mikhail T." Message-ID: <20051028094844.GU39882@cirb503493.alcatel.com.au> References: <200510280518.j9S5I3oQ025430@blue.virtual-estates.net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <200510280518.j9S5I3oQ025430@blue.virtual-estates.net> User-Agent: Mutt/1.4.2.1i X-PGP-Key: http://members.optusnet.com.au/peterjeremy/pubkey.asc Cc: hackers@freebsd.org, hardware@freebsd.org, sos@freebsd.org Subject: Re: Very slow writing to SATA disk X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Oct 2005 09:49:15 -0000 On Fri, 2005-Oct-28 01:18:03 -0400, Mikhail T. wrote: >I've got a new Hitachi drive with 16Mb of cache: > > ad8: 476940MB at ata4-master SATA150 > >and am trying to use it to store backups online. Unfortunately, writing >to the disk is painfully slow (by today's standards) -- it can barely >keep 7Mb/second and my other (SCSI) disks run circles around it. If this drive doesn't support tagged-queueing, is the write cache disabled? I get that sort of performance from a (PATA) disk with the cache disabled (hw.ata.wc="0" in loader.conf) >According to smartctl, the drive runs at 56C during the copying. Its >idle temperature seems to be 54C. I'd double-check that (eg with a finger). If the drive really is running at 56°C, it won't last very long. -- Peter Jeremy