Re: [Hdaps-devel] Re: Updating hard disk firmware & parking harddisk

[Jan Engelhardt]

>> Head parking while the system running is almost useless, since sooner or 
>> later, someone's going to write/read something.
>
>Correct, that's why we're discussing to freeze the request queue as well.

Sounds good (esp. for laptops/notebooks, which should preferably run "on RAM" 
as long as possible)

>But it suffers from the same fate - as soon as the disk receives a new
>request, it will spin up again.

In case of the SUSE bootscripts (and possibly others), some flush barriers are 
engaged, then the disk is spun down and immediately after the poweroff 
happens.

>So there is no gain, except that just
>parking the head without spinning down the spindle can be performed much
>faster.

What's the gain in parking the head manually if it's done anyway when the disk 
spins down (for whatever reason)?



Jan Engelhardt
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