The "noop" elevator - quick and noisy
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- The simplest elevator is the noop elevator.
- noop does not re-order I/O requests - first-come, first-sent.
- noop still may merge I/O requests if it happened to have several
together in the queue when it scanned the queue.
- noop is relevant when we have a better elevator inside the storage
device (e.g. RAID, NCQ, SSD...)