Idle = not doing anything. IO queue is empty.
> Is idle the time it takes between two readahead requests
> to be issued, delaying the second request because you
> just moved the disk arm away ?
Which two readahead requests? It's idle.
> Is idle when we haven't had a request for, say, 3 disk
> seek time periods ?
See above definition of idle.
> Is idle when we won't be getting any request soon for the
> area where the disk arm is hanging out ? (and how do we
> know the future?)
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