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I/O schedulers can have many purposes depending on the goals; common purposes include the following To minimize time wasted by hard disk seeks; To prioritize a certain processes' I/O requests; To give a share of the disk bandwidth to each running process; To guarantee that certain requests will be issued before a particular deadline
The scheduler is an operating system module that selects the next jobs to be admitted into the system and the next process to run. Operating systems may feature up to three distinct scheduler types: a long-term scheduler (also known as an admission scheduler or high-level scheduler), a mid-term or medium-term scheduler, and a short-term scheduler.
Anticipatory scheduling is an algorithm for scheduling hard disk input/output (I/O scheduling). It seeks to increase the efficiency of disk utilization by "anticipating" future synchronous read operations.
The elevator algorithm, or SCAN, is a disk-scheduling algorithm to determine the motion of the disk's arm and head in servicing read and write requests.. This algorithm is named after the behavior of a building elevator, where the elevator continues to travel in its current direction (up or down) until empty, stopping only to let individuals off or to pick up new individuals heading in the ...
The shortest LOOK (S-LOOK) algorithm is an extension of the LOOK algorithm to handle the cases where the disk head is located between the far-end requests. The algorithm is designed to make a decision of which direction should be served first instead of only continuing to seek in the same direction before the new requests have arrived.
FSCAN is a disk scheduling algorithm to determine the motion of the disk's arm and head in servicing read and write requests. It uses two sub-queues. During the scan, all of the requests are in the first queue and all new requests are put into the second queue.
These are algorithms designed for disk scheduling tasks. Pages in category "Disk scheduling algorithms" The following 9 pages are in this category, out of 9 total.
Shortest seek first (or shortest seek time first) is a secondary storage scheduling algorithm to determine the motion of the disk read-and-write head in servicing read and write requests. Description [ edit ]