Re: Loud "pop" coming from hard drive on reboot

[Stephen Clark]

Alan Cox wrote:

> > 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.
> >    
>
> If you see a synchronize cache succeed and you then see the drive
> shutdown succeed then you know that a sync cache can be faked as ok
> safely. Any other command in between or after and it doesn't get faked
>
> This seems pretty easy to deal with at command issue.
>
>  
>
> > 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?
> >    
>
> Probably not, but it will take a year or so and throughout this time
> period everyone with the wrong combination of shutdown and kernel (which
> will be a lot of people who compile their own kernels) are going to have
> problems caused by what is a very obscure piece of libata internal
> behaviour they'll never even know about.
>
>  
So this is the pop I hear on my new laptop that is using 
libata=combined_mode
when I shut my system down. I didn't get the pop with the same disk 
drive in an older
laptop that was only ide. It sounds like a relay closing or opening, 
but is really my
drive head doing an emergency retract/park?

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