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

[Stephen Clark <Stephen.Clark@seclark.us>]

Rob Landley wrote:

> On Tuesday 15 May 2007 5:08 pm, Dave Jones wrote:
>  
>
> > On Mon, May 14, 2007 at 07:32:43PM +0200, Tejun Heo wrote:
> > > Francesco Pretto wrote:
> > > > 2007/5/4, Tejun Heo <htejun@gmail.com>:
> > > >> Yeap, the third iteration of the patch just got submitted.
> > > >>
> > > >>   http://thread.gmane.org/gmane.linux.ide/18485
> > > >>
> > > >> Unfortunately, there doesn't seem to be an easy way out.  We'll need
> > > >> userland shutdown(8) update.
> > > >>
> > > >> -- 
> > > >> tejun
> > > >>
> > > > 
> > > > Ok, i can't understand if the patch will be included in 2.6.22 (i
> > > > didn't see it in the Andrew Morton merge plan). However, if you can
> > > > confirm the inclusion, i can send bug reports for ubuntu and gentoo. I
> > > > can even send an email to Miquel van Smoorenburg, who should be the
> > > > mainstream sysvinit developer (and probably the last maintainer).
> > > 
> > > Okay, the patch made upstream and webpage posted.
> > > 
> > >  http://linux-ata.org/shutdown.html
> >
> > There's a typo..
> >
> > "Check whether /sys/modules/libata/parameters/spindown_compat  exists. If it 
> >    
> does, write 0 to it."
>  
>
> > should be /sys/module/libata/parameters/spindown_compat
> >
> > (no 's' after module)
> >    
>
> Um, hang on.  So libata can't reliably turn the system off without data loss 
> and potential damage to hardware unless userspace goes through a special song 
> and dance?  And this is _not_ considered a defect in the kernel?
>
> Why?
>
> (Is there any other piece of hardware that needs userspace to quiesce it just 
> so the _off_switch_ can take effect?  Yes, I read both the gmane thread and 
> the linux-ata.org link.  I used to maintain the busybox halt/reboot/poweroff 
> commands, although I don't anymore.  That just called reboot(), and this 
> worked.)
>
> Why on _earth_ does complicating software suspend add extra requirements to 
> actual shutdown?  Since when does the shutdown command have to enumerate 
> attached block devices?  If anything this would belong in umount -a, but that 
> doesn't care about the hardware of the underlying block devices and 
> SHOULDN'T...
>
> I'm confused.  Could someone please explain?
>
> Rob
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>  
I agree. This didn't happen when I was just using the ide driver, why 
can't libata work as well
as the old ide driver.

My $.02
Steve

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