linux-kernel - Re: HD head unloads

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Date:	Thu, 16 Nov 2006 01:02:42 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Mark Lord <lkml@....ca>
cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Pavel Machek <pavel@....cz>, Jeff Garzik <jeff@...zik.org>,
	Andi Kleen <ak@...e.de>, John Fremlin <not@...t.any.name>,
	kernel list <linux-kernel@...r.kernel.org>, htejun@...il.com,
	jim.kardach@...el.com
Subject: Re: HD head unloads


On Nov 15 2006 11:58, Jan Engelhardt wrote:
>On Nov 14 2006 13:06, Mark Lord wrote:
>> Jan Engelhardt wrote:
>>> 
>>> Let me jump in here. Short info: Toshiba MK2003GAH 1.8" 20GB PATA
>>> harddisk, in a Sony Vaio U3 (x86, gray-blue PhoenixBIOS).
>>> If idle for more than 5 secs, unloads. Even when not inside any OS, which
>>> really sets me off.
>>>    So I wrote a quick workaround hack for Linux, http://tinyurl.com/y3qs6g
>>> It reads a predefined amount of bytes (just as much to not cause slowdown
>>> yet still cause it to not unload) from the disk at fixed intervals.
>>
>> Thanks for the info.
>> Jan, in your specific case, can you not "fix it" properly with:
>>
>>   hdparm -B255 /dev/?d?
>
>No not really. The unload threshold only raises up to about 15 seconds.

-B254 was more promising: unload timeout was like 2
minutes. What's more: upon every reboot, the power
management value is set back to 128.
    I guess I'll stay with thkd.ko for more time.

	-`J'
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