linux-kernel - Re: Loud "pop" coming from hard drive on reboot

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Date:	Wed, 18 Apr 2007 19:36:23 -0400
From:	Mark Lord <liml@....ca>
To:	Tejun Heo <htejun@...il.com>
Cc:	Chuck Ebbert <cebbert@...hat.com>, emisca <emisca.ml@...il.com>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>, Stephen.Clark@...lark.us
Subject: Re: Loud "pop" coming from hard drive on reboot

Tejun Heo wrote:
> 
> 1. shutdown(8) issues SYNCHRONIZE_CACHE followed by STANDBY_NOW
> 2. kernel shutdown starts
> 3. libata shutdown issues SYNCHRONIZE_CACHE
> 4. power goes off

Okay, after some experimentatino, it's the STANDBY_NOW that
is causing the Power-Off_Retract_Count to increment on my machine.

Tell me again why we think we need to issue that command ?

Thanks.
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