1. Apparatus for implementing feedback directed deferral on nonessential direct access storage device (DASD) operations comprising: a kernel DASD input/output (I/O) manager for maintaining a queue depth count value for a DASD unit; said kernel DASD I/O manager for setting a busy flag responsive to the queue depth count value being greater than a predefined threshold; and said kernel DASD I/O manager for deferring optional operations responsive to the busy flag being set for the DASD unit.