From owner-freebsd-drivers@FreeBSD.ORG Fri Jun 26 07:34:10 2009 Return-Path: Delivered-To: freebsd-drivers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 81401106566C for ; Fri, 26 Jun 2009 07:34:10 +0000 (UTC) (envelope-from mav@mavhome.dp.ua) Received: from cmail.optima.ua (cmail.optima.ua [195.248.191.121]) by mx1.freebsd.org (Postfix) with ESMTP id 042078FC1A for ; Fri, 26 Jun 2009 07:34:09 +0000 (UTC) (envelope-from mav@mavhome.dp.ua) Received: from [212.86.226.226] (account mav@alkar.net HELO mavbook.mavhome.dp.ua) by cmail.optima.ua (CommuniGate Pro SMTP 5.2.9) with ESMTPSA id 246865199; Fri, 26 Jun 2009 09:34:05 +0300 Message-ID: <4A446BDB.5070201@mavhome.dp.ua> Date: Fri, 26 Jun 2009 09:34:03 +0300 From: Alexander Motin User-Agent: Thunderbird 2.0.0.21 (X11/20090405) MIME-Version: 1.0 To: Olivier Nicole References: <1245914580.00131786.1245901202@10.7.7.3> In-Reply-To: <1245914580.00131786.1245901202@10.7.7.3> Content-Type: text/plain; charset=KOI8-R; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-drivers@freebsd.org Subject: Re: Port Multiplier X-BeenThere: freebsd-drivers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Writing device drivers for FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Jun 2009 07:34:10 -0000 Olivier Nicole wrote: > Is port multiplier supported in FreeBSD 7.2 RELENG? No, it is only supported in 8-CURRENT now. > I want to build a cheap storage for backup, with SiI3124 card (or > another cheap card with PCI/PCI-X). Not so much cards are supporting FIS Based Switching technology (and none of FreeBSD SATA drivers at this moment) needed to operate drives beyond PM in parallel. So you will not obtain any performance benefit from having several drives connected to the same controller channel, just an additional capacity. -- Alexander Motin