From owner-freebsd-questions@FreeBSD.ORG Fri Sep 24 16:49:21 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id F388116A4CE for ; Fri, 24 Sep 2004 16:49:20 +0000 (GMT) Received: from smtp.knology.net (smtp.knology.net [24.214.63.101]) by mx1.FreeBSD.org (Postfix) with SMTP id 8FD3043D45 for ; Fri, 24 Sep 2004 16:49:20 +0000 (GMT) (envelope-from dkelly@HiWAAY.net) Received: (qmail 9178 invoked by uid 0); 24 Sep 2004 16:49:41 -0000 Received: from user-69-73-60-132.knology.net (HELO ?10.0.0.68?) (69.73.60.132) by smtp2.knology.net with SMTP; 24 Sep 2004 16:49:41 -0000 In-Reply-To: <20030514100035.GA12919@submonkey.net> References: <20030513190247.H1682@asu.edu> <20030514100035.GA12919@submonkey.net> Mime-Version: 1.0 (Apple Message framework v619) Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: David Kelly Date: Fri, 24 Sep 2004 11:49:15 -0500 To: Ceri Davies X-Mailer: Apple Mail (2.619) cc: dwbear75@gmail.com cc: freebsd-questions@freebsd.org Subject: Re: serial ATA interface X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Sep 2004 16:49:21 -0000 On May 14, 2003, at 5:00 AM, Ceri Davies wrote: > On Tue, May 13, 2003 at 07:02:47PM -0700, David Bear wrote: >> I just learned of the new hardware serial ata standard -- much faster >> throughput, different form factor, etc. does freebsd support it now >> or does it look enough like standard ata that freebsd doesn't care? > > sos already committed support for a promise s-ata controller, making > FreeBSD first to support this as far as I'm aware. > I don't think that made it to -STABLE yet though. I haven't tried it on the 4 branch but in 5.2.1 and 5.3-BETA SATA works just fine for me: ad4: 157066MB [319120/16/63] at ata2-master SATA150 ad6: 157066MB [319120/16/63] at ata3-master SATA150 IIRC the SATA spec is downward compatible with PATA so at least in theory a SATA drive and interface will work everywhere. As for speed and performance claims, "Bah humbug." The initial SATA interface is 150 MB/sec. I've never seen a single drive sustain over 55 MB/sec. so as long as your interface is a bit faster than your hardware then its not an issue. Where the real gains are to be made is with the command set cleanup being undertaken with SATA. Useful multitasking features from SCSI are working their way into the 2nd generation of SATA drives. SATA uses a nice small cable and connector. Each drive has its own cable without the master/slave silliness so there could/should be a performance increase where one uses both drives at the same time. -- David Kelly N4HHE, dkelly@HiWAAY.net ======================================================================== Whom computers would destroy, they must first drive mad.