linux-kernel - Re: 2.6.18-rc2, problem to wake up spinned down drive?

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Date:	Sun, 30 Jul 2006 14:57:23 +0200
From:	Harald Dunkel <harald.dunkel@...nline.de>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.18-rc2, problem to wake up spinned down drive?

Hi Hannes,

Johannes Weiner wrote:
> Hi,
> 
> On Sun, Jul 30, 2006 at 02:01:02PM +0200, Harald Dunkel wrote:
>> Hi folks,
>>
>> I tried to spin down my harddisk using hdparm, but when it is
>> supposed to spin up again, [...]
> 
> When is the point reached to spin up again?
> 

When some process tries to access a file that is not
cached in RAM, AFAICT. All partitions are mounted with
noatime.

>> On another machine (with a SAMSUNG SP2504C inside) there is no
>> such problem: The disk is back after just a few seconds.
> 
> Same kernel?
> 

Yes. But both machines are very different. The working
machine is an amd64 with nforce2. The machine that gets
stuck is a 2 GHz Pentium M with some Intel chipset:

00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Controller (rev 04)
00:1f.2 0101: 8086:2651 (rev 04)

Sorry, surely I should have mentioned this before. The
problem isn't _that_ reproducible.

Regards

Harri

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