From owner-freebsd-hackers@FreeBSD.ORG  Thu Feb  4 02:09:36 2010
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 742281065693
	for <freebsd-hackers@freebsd.org>; Thu,  4 Feb 2010 02:09:36 +0000 (UTC)
	(envelope-from erich@alogreentechnologies.com)
Received: from nomoremozzie.com (nomoremozzie.com [67.212.226.44])
	by mx1.freebsd.org (Postfix) with ESMTP id 3E2748FC15
	for <freebsd-hackers@freebsd.org>; Thu,  4 Feb 2010 02:09:36 +0000 (UTC)
Received: from [192.168.0.110] ([112.199.163.122]) (authenticated bits=0)
	by nomoremozzie.com (8.13.1/8.13.1) with ESMTP id o1429Id1012662;
	Wed, 3 Feb 2010 19:09:34 -0700
From: Erich Dollansky <erich@alogreentechnologies.com>
Organization: ALO Green Technologies Pte Ltd
To: freebsd-hackers@freebsd.org
Date: Thu, 4 Feb 2010 10:09:03 +0800
User-Agent: KMail/1.9.10
References: <201002031343.o13Dhj7i052507@lurza.secnetix.de>
	<alpine.BSF.2.00.1002031328060.9787@wonkity.com>
In-Reply-To: <alpine.BSF.2.00.1002031328060.9787@wonkity.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <201002041009.05222.erich@alogreentechnologies.com>
X-Mailman-Approved-At: Thu, 04 Feb 2010 02:18:05 +0000
Cc: alexbestms@wwu.de, Oliver Fromme <olli@lurza.secnetix.de>, jkim@freebsd.org
Subject: Re: Spin down HDD after disk sync or before power off
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 04 Feb 2010 02:09:36 -0000

Hi,

let me do.

On 04 February 2010 am 04:44:04 Warren Block wrote:
> On Wed, 3 Feb 2010, Oliver Fromme wrote:
> 
> > Alexander Best wrote:
> > No -- *Please* make sure that the disks are only spun down
> > upon an actual power-off command (i.e. when reboot() is
> 
> Could you elaborate a little on why that's bad?  It seems like it would 
> be similar to a standby/resume action.
> 
every disk has a limited number of restarts before it dies.

In case of a reboot, it is already known when the command is given that the machine will restart without being powered of.

If you spin-down the disk, you lose one start cycle.

It is not that important but if it can be done with just one if, please, just do it.

Erich