What if several requests have different deadlines that are relatively close together?
In this case, SCAN-EDF may batch requests, using
SCAN ordering to service requests in the same batch. There are many techniques
for batching requests with similar deadlines; the only requirement is that
reordering requests within a batch must not prevent a request from being
serviced by its deadline. If deadlines are equally distributed, batches can be
organized in groups of a certain size—say, 10 requests per batch.