Question
Which I/O scheduling algorithm is designed to reduce the
average response time for disk operations by prioritizing requests based on proximity to the current head position?ÂSolution
The Shortest Seek Time First (SSTF) I/O scheduling algorithm is designed to optimize the order in which disk I/O requests are serviced by selecting the request that is closest to the current head position of the disk arm. This approach minimizes the seek time— the time it takes for the disk's read/write head to move to the location of the data to be read or written— thereby reducing the average response time for disk operations. SSTF improves overall system efficiency by ensuring that the most immediate requests are handled first, decreasing waiting times for processes that rely on disk access. However, while SSTF enhances average response time, it may lead to starvation for requests located further from the current head position, as these requests may continually be deferred in favor of closer ones. Therefore, while SSTF strikes a balance between efficiency and responsiveness, it is essential to be mindful of its potential impact on fairness in resource allocation. Option A (FCFS) - First-Come, First-Served is a straightforward scheduling method that can lead to increased wait times, especially if a lengthy seek operation occurs before shorter requests. Option C (SCAN) - The SCAN algorithm moves the disk arm in one direction, servicing requests until it reaches the end before reversing. While effective, it does not prioritize requests based on proximity. Option D (LOOK) - LOOK is similar to SCAN but only goes as far as the last request in one direction before reversing, which may still leave some requests unserviced for a long time. Option E (Round Robin) - Round Robin is typically used for CPU scheduling rather than I/O scheduling, where requests are serviced in a cyclical order without considering their location.
Find the total distance covered by boat in each upstream and downstream in 5 hours if the speed of boat in still water and speed of current is 20 km/h a...
- A motorboat covers 96 km downstream in 4 hours. Coming back upstream over the same distance, it takes 8 hours longer than the downstream time. Find the spe...
If the sum of upstream and downstream speed is 30 km/hr and the speed of the current is 6 km/hr. Then find time taken to cover 84 km in downward?
Speed of boat is 25 km/hr. Speed of the stream is 20% less than speed of boat. Then find time taken by boat to go 90 km downstream?
The speed of a boat in still water is 6 km/hr more than that of the current. The time taken by the boat to cover 875 km downstream is 17.5 hours. Find t...
A man can row his boat with the stream at 22 km/h and against the stream in 7 km/hours. The man’s rate isÂ
Speed of a boat in still water to speed of boat in upstream is 11:7. If the boat can travel 300 km in downstream in 5 hours, then find the time taken by...
A boat running downstream covers a distance of 32 km in 4 hrs and covering the same distance upstream in 16 hrs. What is the speed of a boat in still wa...
A boat travels the same distance 'd' km in both upstream and downstream directions, taking a total of 15 hours for the round trip. If the downstream spe...
A boat’s speed in still water is 1.5 times the speed of the current. It takes the boat 22.5 hours to travel 90 km upstream. If ...