From owner-freebsd-questions@FreeBSD.ORG Sun Jul 27 04:24:33 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 36F8B1065679 for ; Sun, 27 Jul 2008 04:24:33 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from ch-smtp02.sth.basefarm.net (ch-smtp02.sth.basefarm.net [80.76.149.213]) by mx1.freebsd.org (Postfix) with ESMTP id E24A08FC0C for ; Sun, 27 Jul 2008 04:24:32 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from c83-253-25-183.bredband.comhem.se ([83.253.25.183]:60993 helo=falcon.midgard.homeip.net) by ch-smtp02.sth.basefarm.net with esmtp (Exim 4.68) (envelope-from ) id 1KMxo8-00053p-6X for freebsd-questions@freebsd.org; Sun, 27 Jul 2008 06:24:32 +0200 Received: (qmail 96136 invoked from network); 27 Jul 2008 06:24:29 +0200 Received: from owl.midgard.homeip.net (10.1.5.7) by falcon.midgard.homeip.net with ESMTP; 27 Jul 2008 06:24:29 +0200 Received: (qmail 110 invoked by uid 1001); 27 Jul 2008 06:24:29 +0200 Date: Sun, 27 Jul 2008 06:24:29 +0200 From: Erik Trulsson To: Jason Lenthe Message-ID: <20080727042429.GA99908@owl.midgard.homeip.net> References: <488BE9F2.1070409@comcast.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <488BE9F2.1070409@comcast.net> User-Agent: Mutt/1.5.18 (2008-05-17) X-Originating-IP: 83.253.25.183 X-Scan-Result: No virus found in message 1KMxo8-00053p-6X. X-Scan-Signature: ch-smtp02.sth.basefarm.net 1KMxo8-00053p-6X 9918f659a68059d3636d33cc28320fa5 Cc: freebsd-questions@freebsd.org Subject: Re: SATA300 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 27 Jul 2008 04:24:33 -0000 On Sat, Jul 26, 2008 at 11:22:26PM -0400, Jason Lenthe wrote: > My machine, a home-brew running 7.0-RELEASE-p2, has 3 SATA hard drives > all of which were advertised as SATA300 drives, but: > > vader# dmesg | grep ATA > ata0: on atapci0 > ata1: on atapci0 > atapci1: port > 0x20c8-0x20cf,0x20ec-0x20ef,0x20c0-0x20c7,0x20e8-0x20eb,0x20a0-0x20af > irq 19 at device 31.2 on pci0 > ata2: on atapci1 > ata3: on atapci1 > ad4: 305245MB at ata2-master SATA150 > ad5: 476940MB at ata2-slave SATA150 > ad6: 305245MB at ata3-master SATA150 > > Does this mean I'm only getting half the throughput I could be getting? Considering that the fastest SATA drives available today tops out at a throughput of about 120MB/s (and most are quite a bit slower), I would say that any speed loss from running at SATA150 speed instead of SATA300 will be fairly minor and probably not even noticable. Many SATA hard drives have a jumper that can be used to limit them to SATA150 speeds. It is often set by default, since some older SATA controllers fail to auto-negotiate speed correctly, so the drive must be running at SATA150 to work with those controllers. See if you drives have such a jumper set. If so try removing it. -- Erik Trulsson ertr1013@student.uu.se