block device queues, elevatoring implicit or explicit?

From: Raymond Jennings
Date: Sat Mar 16 2013 - 05:06:45 EST

Are all block devices fundamentally elevators or fifos or what?

To be blunt, if a bunch of concurrent processes dump requests on a
noop queue, are they serviced fifo or in elevator order or what?

My goal is to get a dumb elevator that does nothing but sweep up and
down the disk mopping up outstanding requests as the disk heads ooze
across the sectors.
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