linux-kernel - Re: Weird hard disk noise on shutdown (bug #7674)

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Message-ID: <45DD420F.4000501@gmail.com>
Date:	Thu, 22 Feb 2007 16:11:11 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Robert Hancock <hancockr@...w.ca>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Alan <alan@...rguk.ukuu.org.uk>, ceztko@...il.com
Subject: Re: Weird hard disk noise on shutdown (bug #7674)

Robert Hancock wrote:
> Robert Hancock wrote:
>> Alan wrote:
>>> Stick some printk calls in drivers/ata/libata-eh.c in ata_eh_suspend, or
>>> turn on all the ATA debug and shutdown, the code should issue a cache
>>> flush followed by a standbynow1 command for each disk.
>>>
>>> Alan
>>
>> I believe it runs on suspend, but we don't run that code on normal
>> shutdown, do we?
>>
>> Tejun Heo had a patch for sd that could (optionally) trigger a START
>> STOP UNIT command to spin the disk down after synchronizing the cache
>> before shutdown, but I haven't heard anything of it lately..

I just came back from LSF and lunar new year's holidays and need a bit
more time to get to it.  I'll get to it in one or two weeks.

-- 
tejun
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