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

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Date:	Wed, 18 Apr 2007 21:50:35 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	7eggert@....de, 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>
Subject: Re: Loud "pop" coming from hard drive on reboot

Tejun Heo wrote:
> Alan Cox wrote:
>>> Not that simple.  Most disks don't spin up on SYNCHRONIZE_CACHE if 
>>> its cache is clean.  Sadly some disks actually spin up when it 
>>> receives spin down command while spun down to immediately spin down 
>>> again, so we would be fixing problem for some number of disks while 
>>> breaking others.  :-(
>>
>> Snoop the last command sent to the drive, that tells you if you can skip
>> the cache flush ?
> 
> Thought about that and querying power state before doing shutdown 
> sequence but things get somewhat ugly because shutdown sequence is 
> driven from sd->shutdown().  We'll have to snoop both sync and shutdown 
> commands and check whether the system is shutting down.  Also, I felt 
> very uneasy about faking successful completion to SYNCHRONIZE_CACHE.
> 
> I dunno.  It's already too late for 2.6.21.  I was hoping we could get 
> distros to update shutdown utilities in not-too-distant future but I 
> have no experience with that.  Is that just a wishful thinking?
> 

FWIW, the the following message describes the proposed solution.

http://thread.gmane.org/gmane.linux.scsi/30487/focus=17392

-- 
tejun
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