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

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Date:	Thu, 19 Apr 2007 13:50:33 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Stephen.Clark@...lark.us
CC:	Mark Lord <liml@....ca>, Tejun Heo <htejun@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, 7eggert@....de,
	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>
Subject: Re: Loud "pop" coming from hard drive on reboot

Stephen Clark wrote:
> Mark Lord wrote:
> 
>> Mark Lord wrote:
>>  
>>
>>> With the patch applied, I don't see *any* new activity in those
>>> S.M.A.R.T.
>>> attributes over multiple hibernates (Linux "suspend-to-disk").
>>>   
>>
>> Scratch that -- operator failure.  ;)
>> The patch makes no difference over hibernates in the SMART logs.
>>
>> It's still logging extra Power-Off_Retract_Count pegs,
>> which it DID NOT USED TO DO not so long ago.
>>
>> Now I'll poke at the shutdown again.
>>
>> Meanwhile, Stephen:  Could you try without this line in the patched file:
>>
>>        case ATA_16:
>> +               dev->needs_sync_cache = 1;
>>
>> Ie. comment out that last "dev->needs_sync_cache" line.
>>
>>
> No joy - even with that line commented out I get a click and my
> Power-Off_Retract_Count has incremented.
> 

I found a solution of sorts on Fedora 6:


Edit /etc/rc0.d/S01halt, changing the third-from-last line so it reads:

HALTARGS="-d -h -n"

Then use the halt(8) command to shut down and turn off the power manually.
No click and the "retract" counter does not increment. (Even this procedure
incremented the counter until I changed the script.)

Seems safe, using the IDE drivers, since they sync the cache anyway.

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