From owner-freebsd-stable@FreeBSD.ORG Mon Jul 20 15:16:01 2009 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 DC5C11065672 for ; Mon, 20 Jul 2009 15:16:01 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 9807C8FC22 for ; Mon, 20 Jul 2009 15:16:00 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1MSuar-0006PJ-8S for freebsd-stable@freebsd.org; Mon, 20 Jul 2009 15:15:57 +0000 Received: from lara.cc.fer.hr ([161.53.72.113]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 20 Jul 2009 15:15:57 +0000 Received: from ivoras by lara.cc.fer.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 20 Jul 2009 15:15:57 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-stable@freebsd.org From: Ivan Voras Date: Mon, 20 Jul 2009 17:15:46 +0200 Lines: 25 Message-ID: References: <4A643F5B.8080806@mapper.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: lara.cc.fer.hr User-Agent: Thunderbird 2.0.0.21 (X11/20090615) In-Reply-To: <4A643F5B.8080806@mapper.nl> Sender: news Subject: Re: ZFS RAIDZ and atacontrol spindown settings 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: Mon, 20 Jul 2009 15:16:02 -0000 Mark Stapper wrote: > Good day, > > I am the proud user of a FreeBSD 7.2 AMD64 system housing, amongst other > things, a data server. > My "server"(It's called "Yoshi") runs FreeBSD from a mirrored system > disc, and has a zfs RAIDZ array with 4 discs for bulky data. > As it is a home server, and I work during the day, these four discs were > spinning happily all day long without much use for them doing so. > To save the world(and money) I issued the command "atacontrol spindown > 1800" for all the discs in my array spinning them down after thirty > minutes of idle spinning. > So far so good, me very happy! However, when I access the array after > the discs have been spun down, it spins up the discs one after the other... > Mind you one AFTER the other, taking 4*9 seconds to do a "ls" command on > my music directory. > Content as I am with the smooth down- and upspinning of the disks, I > would like it better if the four discs would spin up simultaneously. > Thus my question: "Is it possible to \"group\" discs to be spun up > together, or to issue a custom command upon upspinning of a disc such as > to spin up other disks?" Good question but the answer is probably no - it really only depends on how ZFS accesses the drives; if it accesses them in sequence, you can't change it.