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COMPARISON OF DISK SCHEDULING ALGORITHMS
Name Description Remarks (Selection according to requestor)
RSS Random scheduling for analysis and simulation
FIFO First in first out Fairest of them all
PRI Priority by process Control outside of disk queue management
LIFO Last in first out Maximize locality and resource utilization
(Selection according to requested item)
SSTF Shortest seek time first High utilization, small queues
SCAN Back and forth over disk Better service distribution
C-SCAN One way with fast return Lower service variability
N-step-SCAN Multiple queues Scan N records at a time
Service guarantee
FSCAN SCAN using 2 queues load sensitive
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code for implementing NFU page replacement algorithm
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