Table of Contents
Disk scheduling algorithms are essential for managing how data is read from and written to storage devices. They aim to optimize performance while ensuring fair access for all processes. Different algorithms prioritize various aspects such as speed, fairness, or resource utilization.
Common Disk Scheduling Algorithms
- First-Come, First-Served (FCFS)
- Shortest Seek Time First (SSTF)
- SCAN and C-SCAN
- LOOK and C-LOOK
Efficiency Considerations
Efficiency in disk scheduling is often measured by the average seek time and throughput. Algorithms like SSTF aim to reduce seek time by selecting the closest request, but may cause starvation for some requests. SCAN and C-SCAN move the disk arm in a single direction, providing a balance between speed and fairness.
Fairness and Starvation
Fairness ensures that all processes receive timely access to disk resources. Algorithms like FCFS are fair but may be inefficient. To prevent starvation, algorithms such as C-SCAN cycle through requests in a circular manner, giving each request a chance to be serviced.