> Err, not quite the whole story. It is *never* right to leave the disk
> sitting idle while there are dirty, writable IO buffers.
Define "idle" ?
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 ?
Is idle when we haven't had a request for, say, 3 disk
seek time periods ?
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?)
regards,
Rik
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