From owner-freebsd-hackers Mon Feb 26 15: 3:35 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from mail3.wi.rr.com (fe3.rdc-kc.rr.com [24.94.163.50]) by hub.freebsd.org (Postfix) with ESMTP id E87A137B401 for ; Mon, 26 Feb 2001 15:03:31 -0800 (PST) (envelope-from hamilton@pobox.com) Received: from woodstock.monkey.net ([24.167.246.123]) by mail3.wi.rr.com with Microsoft SMTPSVC(5.5.1877.537.53); Mon, 26 Feb 2001 16:59:49 -0600 Received: by woodstock.monkey.net (Postfix, from userid 500) id B743928; Mon, 26 Feb 2001 17:02:20 -0600 (CST) Date: Mon, 26 Feb 2001 17:02:20 -0600 From: Jon Hamilton To: Soren Schmidt Cc: Stephen Rose , freebsd-hackers@FreeBSD.ORG, Joe Gleason Subject: Re: ata-disk ioctl and atactl patch Message-ID: <20010226170220.A67952@woodstock.monkey.net> References: <200102262010.VAA29823@freebsd.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200102262010.VAA29823@freebsd.dk>; from sos@freebsd.dk on Mon, Feb 26, 2001 at 09:10:43PM +0100 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Soren Schmidt , said on Mon Feb 26, 2001 [09:10:43 PM]: } It seems Stephen Rose wrote: } > A couple of us on the questions list have asked for a way to spin down ide } > disks when idle. Is there any chance that this utility could lead to } > something useful there? } } Well, of cause it could, but I'm not sure I see the usefullness of } the spindown at all, a spinup costs several units of idleness power, } so you have to keep it spun down for long periods to make it worth } the effort, and you wear significantly more on the mechanics this } way too... Others have posted from their experiments that they were able to maintain a spun down state for upwards of an hour (admittedly, with some care and planning). There are also lots of odd uses where one might have long periods of inactivity, such as a laptop on which you log in to a "real machine" to do some kind of work, and want to leave the display going without having to listen to the disk (for whatever reason). I often leave mine listening for incoming messages for hours at a time, and appreciate being able to shut up the disk. I'm using a different method to accomplish the goal, but the desire that led me there is what's important for purposes of this discussion. Are there other ways to accomplish the same thing? Sure. But this desire isn't per se unreasonable on its face. It's not a good fit for lots of systems, but there are cases where it's desirable. -- Jon Hamilton hamilton@pobox.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message