Messages in this thread | | | Date | Wed, 18 Apr 2007 09:39:30 -0400 | From | Stephen Clark <> | Subject | Re: Loud "pop" coming from hard drive on reboot |
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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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