From owner-freebsd-stable@FreeBSD.ORG Sun Feb 14 22:16:27 2010 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 4C2E31065670; Sun, 14 Feb 2010 22:16:27 +0000 (UTC) (envelope-from dan@langille.org) Received: from nyi.unixathome.org (nyi.unixathome.org [64.147.113.42]) by mx1.freebsd.org (Postfix) with ESMTP id 1EA188FC13; Sun, 14 Feb 2010 22:16:26 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by nyi.unixathome.org (Postfix) with ESMTP id B111B50843; Sun, 14 Feb 2010 22:16:25 +0000 (GMT) X-Virus-Scanned: amavisd-new at unixathome.org Received: from nyi.unixathome.org ([127.0.0.1]) by localhost (nyi.unixathome.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pQ+MI5SZwSy3; Sun, 14 Feb 2010 22:16:24 +0000 (GMT) Received: from smtp-auth.unixathome.org (smtp-auth.unixathome.org [10.4.7.7]) (Authenticated sender: hidden) by nyi.unixathome.org (Postfix) with ESMTPSA id 29FE550823 ; Sun, 14 Feb 2010 22:16:24 +0000 (GMT) Message-ID: <4B78763E.5080105@langille.org> Date: Sun, 14 Feb 2010 17:16:30 -0500 From: Dan Langille User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: Alexander Motin References: <1265617382.00216602.1265605802@10.7.7.3> <1265707385.00217197.1265696404@10.7.7.3> <1265728980.00217271.1265715603@10.7.7.3> <1265750583.00217397.1265739002@10.7.7.3> <1265754184.00217418.1265743204@10.7.7.3> <1265756530.00217435.1265745602@10.7.7.3> <1265790181.00217606.1265778601@10.7.7.3> <1265842691.00217889.1265831404@10.7.7.3> <4B78382E.8080905@FreeBSD.org> In-Reply-To: <4B78382E.8080905@FreeBSD.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: FreeBSD Stable , Steve Polyack Subject: Re: hardware for home use large storage 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: Sun, 14 Feb 2010 22:16:27 -0000 Alexander Motin wrote: > Steve Polyack wrote: >> On 2/10/2010 12:02 AM, Dan Langille wrote: >>> Don't use a port multiplier and this goes away. I was hoping to avoid >>> a PM and using something like the Syba PCI Express SATA II 4 x Ports >>> RAID Controller seems to be the best solution so far. >>> >>> http://www.amazon.com/Syba-Express-Ports-Controller-SY-PEX40008/dp/B002R0DZWQ/ref=sr_1_22?ie=UTF8&s=electronics&qid=1258452902&sr=1-22 >> Dan, I can personally vouch for these cards under FreeBSD. We have 3 of >> them in one system, with almost every port connected to a port >> multiplier (SiI5xxx PMs). Using the siis(4) driver on 8.0-RELEASE >> provides very good performance, and supports both NCQ and FIS-based >> switching (an essential for decent port-multiplier performance). >> >> One thing to consider, however, is that the card is only single-lane >> PCI-Express. The bandwidth available is only 2.5Gb/s (~312MB/sec, >> slightly less than that of the SATA-2 link spec), so if you have 4 >> high-performance drives connected, you may hit a bottleneck at the >> bus. I'd be particularly interested if anyone can find any similar >> Silicon Image SATA controllers with a PCI-E 4x or 8x interface ;) > > Here is SiI3124 based card with built-in PCIe x8 bridge: > http://www.addonics.com/products/host_controller/adsa3gpx8-4em.asp > > It is not so cheap, but with 12 disks connected via 4 Port Multipliers > it can give up to 1GB/s (4x250MB/s) of bandwidth. > > Cheaper PCIe x1 version mentioned above gave me up to 200MB/s, that is > maximum of what I've seen from PCIe 1.0 x1 controllers. Looking on NCQ > and FBS support it can be enough for many real-world applications, that > don't need so high linear speeds, but have many concurrent I/Os. Is that the URL you meant to post? "4 Port eSATA PCI-E 8x Controller for Mac Pro". I'd rather use internal connections.