From owner-freebsd-current@FreeBSD.ORG Wed Feb 3 14:00:48 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EFE62106566C for ; Wed, 3 Feb 2010 14:00:48 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.159]) by mx1.freebsd.org (Postfix) with ESMTP id 795718FC12 for ; Wed, 3 Feb 2010 14:00:48 +0000 (UTC) Received: by fg-out-1718.google.com with SMTP id l26so269834fgb.13 for ; Wed, 03 Feb 2010 06:00:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:message-id:date:from :user-agent:mime-version:to:cc:subject:references:in-reply-to :x-enigmail-version:content-type:content-transfer-encoding; bh=onQv4SQ/d05aRx+4WtBdclr6m8ZffBPAinyL2fE+kkk=; b=VNHQJU9Snx0rYBepilT7B3QYnZRRrpdcJ1pxID/3vUKYItxB13heSpLhuGfWrbsjNV IuMorNYLLhbL2bJsUtNdXp5H0K7CC7bZOA5kf5wFw/LKDNROAbJGAf47f0V8yiyMge9N bD3/7zzo7FKHQKuoi57vvcbJTaA7KLAzl2uZc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type :content-transfer-encoding; b=yB+LkZvZWrIn1hCmDxtBpPpqNysRz8n03Y/g1bMMpSBMb5mOEXyuFOxSxg9a9TMv9n pLmDGmmprl32L84kouSr82Z/du0XRjY3gAw5NVm2QR5XoyJGUu5HgiIzDSwbuL75x12Y GRw5Kr640x/Ne8lg4blO+H/3unyDg2f4oSHVk= Received: by 10.87.15.29 with SMTP id s29mr1610403fgi.34.1265205647171; Wed, 03 Feb 2010 06:00:47 -0800 (PST) Received: from mavbook.mavhome.dp.ua (pc.mavhome.dp.ua [212.86.226.226]) by mx.google.com with ESMTPS id 13sm3169130fxm.13.2010.02.03.06.00.45 (version=SSLv3 cipher=RC4-MD5); Wed, 03 Feb 2010 06:00:46 -0800 (PST) Sender: Alexander Motin Message-ID: <4B69817B.8090706@FreeBSD.org> Date: Wed, 03 Feb 2010 16:00:27 +0200 From: Alexander Motin User-Agent: Thunderbird 2.0.0.23 (X11/20091212) MIME-Version: 1.0 To: "James R. Van Artsdalen" References: <4B55D9D4.1000008@FreeBSD.org> <823F6536-32A7-4BC6-9C6A-C84865A38458@samsco.org> <4B570B4C.9000203@jrv.org> In-Reply-To: <4B570B4C.9000203@jrv.org> X-Enigmail-Version: 0.96.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: FreeBSD-Current Subject: Re: Pack of CAM improvements X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Feb 2010 14:00:49 -0000 James R. Van Artsdalen wrote: > At some point I hope to add support for staggered spin-ups, perhaps a > loader.conf setting for people with more than 20-30 disks. At the > 100-120 disk level it seems unlikely that any reasonable fixed delay > would be reasonable. I've just added Power Up In Stand-by (PUIS) feature support into CAM ATA in HEAD. It is one of the ways to implement staggered spin-up for ATA devices. Now CAM will spin-up no more then 4 of such devices at a time. Another way, based on SATA hard-reset sequence, is more complicated (especially when port multipliers used) and not supported yet. -- Alexander Motin