A Comparative Analysis of Disk Scheduling Algorithms (original) (raw)
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STUDY OF DIFFERENT ALGORITHMS USE FOR DISK SCHEDULING PROCESS
This paper aims to discuss the functioning of a disk and the comparative procedure involved in the retrieval of data on a direct access storage device by different algorithms. Efficiency of the different Disk Scheduling algorithms such as First Come First Serve (FCFS), Shortest Seek Time First (SSTF), Scan, Circular Scan (C-Scan) Scheduling algorithm. Disk requests execution and their pros and cons are also provided in this paper in order to make contrasts and comparisons of performance of the said algorithms. This paper also shows the differentiating abilities of the different scheduling algorithms and its effect to storage management, a better analysis of what disk scheduling algorithms do and how these amend the performance of servicing disk requests.
SSRN Electronic Journal, 2019
The objective of this paper is to identify the benefits and drawbacks of the disk scheduling algorithms and proposing an improved algorithm. The performance of a disk drive depends on various factors like seek time, latency time, access time and structure of the disk. This paper covers the comparative analysis of famous disk scheduling algorithms and proposal of a new algorithm with better performance. [1]Since the performance is based on seek time and access time which are dependent on head movement of the disk arm. Therefore, this paper focuses on comparing the head movement of the various algorithms with the new algorithm and concludes on the performance of the algorithms.
One of the main goal of the operating system for the disk drives is to use the hardware efficiently. we can meet this goal using fast access time and large disk bandwidth that depends on the relative positions of the read-write head and the requested data. Since memory management allows multiprogramming so that operating system keeps several read/write request in the memory. In order to service these requests, hardware (disk drive and controller) must be used efficiently. To support this in disk drive, the hardware must be available to service the request. if the hardware is busy, we can’t service the request immediately and the new request will be placed in the queue of pending requests. Several disk scheduling algorithms are available to service the pending requests. among these disk scheduling algorithms, the algorithm that yields less number of head movement will remain has an efficient algorithm. In this research paper, we propose a new disk scheduling algorithm that will reduce the number of movement of head thereby reducing the seek time and it improves the disk bandwidth for modern storage devices. Our results and calculations show that, proposed disk scheduling algorithm will improve the performance of disk i/o by reducing average seek time compared to the existing disk scheduling algorithm. For few requests, the seek time and the total number of head movement is equal to SSTF or LOOK scheduling.
Design and Performance Evaluation of an Optimized Disk Scheduling Algorithm (ODSA)
International Journal of …, 2012
Management of disk scheduling is a very important aspect of operating system. Performance of the disk scheduling completely depends on how efficient is the scheduling algorithm to allocate services to the request in a better manner. Many algorithms (FIFO, SSTF, SCAN, C-SCAN, LOOK, etc.) are developed in the recent years in order to optimize the system disk I/O performance. By reducing the average seek time and transfer time, we can improve the performance of disk I/O operation. In our proposed algorithm, Optimize Disk Scheduling Algorithm (ODSA) is taking less average seek time and transfer time as compare to other disk scheduling algorithms (FIFO, SSTF, SCAN, C-SCAN, LOOK, etc.), which enhances the efficiency of the disk performance in a better manner.
A New Heuristic Disk Scheduling Algorithm
International Journal of Scientific & Technology Research, 2013
Since the invention of the movable head disk, people have improved I/O performance by intelligent scheduling of disk accesses. Processor speed and memory capacity are increasing several times faster than disk speed. This disparity suggests that disk I/O performance w ill become an important bottleneck .Methods are needed for using disks more efficiently. Past analysis of disk scheduling algorithms has largely been experimental and little attempt has been made to develop algorithms w ith provable performance guarantees. Disk performance management is an increasingly important aspect of operating system research and development. In this paper a new disk scheduling algorithm has been proposed to reduce the number of movement of head. It is observed that in existing scheduling algorithms the number of head movement is high. But we proposed a new real- time disk scheduling algorithm that reduces the head movement therefore it maximizes throughput for modern storage devices.
Major Half Served First (MHSF) Disk Scheduling Algorithm
I/O performance has been improved by proper scheduling of disk accesses since the time movable head disk came into existence. Disk scheduling is the process of carefully examining the pending requests to determine the most efficient way to service the pending requests. Scheduling algorithms generally concentrate on reducing seek times for a set of requests, because seek times tend to be an order of magnitude greater than latency times. Some important scheduling algorithms are First-Come-First-Served (FCFS), Shortest Seek Time First (SSTF), SCAN, Circular Scan (C-SCAN) and LOOK. This paper proposes a new disk scheduling algorithm called Major Half Served First (MHSF). Simulation results show that using MHSF the service is fast and seek time has been reduced drastically.
An Improved FCFS (IFCFS) Disk Scheduling Algorithm
Since the time movable head disk came into existence, the I/O performance has been improved by proper scheduling of disk accesses. Disk scheduling involves a careful examination of pending requests to determine the most efficient way to service the requests. The two most common types of scheduling are seek optimization and rotational (or latency) optimization. Most of the scheduling algorithms concentrate on reducing seek times for a set of requests, because seek times tend to be an order of magnitude greater than latency times. Some of the most important scheduling algorithms are First-Come-First-Served (FCFS), Shortest Seek Time First (SSTF), SCAN, Circular Scan (C-SCAN) and LOOK. FCFS is the simplest form of disk scheduling algorithm. This algorithm is simple to implement, but it generally does not provide the fastest service. This paper describes an improvement in FCFS. A simulator program has been designed and tested the improved FCFS. After improvement in FCFS it has been found that the service is fast and seek time has been reduced drastically.
Analysis of Traditional Hard Disk Scheduling Algorithms: A Review
Quaid-e-Awam University Research Journal of Engineering Science & Technology, 2021
This review paper compares the various disk scheduling algorithms that are used to schedule processes in a queue, such as FCFS, SSTF, SCAN, C-SCAN, LOOK, C-LOOK, OTHDSA, and Zone Base Disk Scheduling, and then applies all of these techniques to two data sets to assess the performance of each algorithm. The comparison includes updated and improved techniques that show promising results in collecting data from the digital store. The comparison results were also contrasted with supporting the statement that all disk scheduling algorithms' technique offers much better performance. The comparison shows that among all disk scheduling algorithms, OTHDSA has excellent performance and takes a search time of 250 to complete all requests in a queue.
Simulation and Performance Comparison of Four Disk Schedulingalgorithms
TENCON 2000. Proceedings, 2000
Hard disks are being used to store huge informatioddata in all modem computers. Disk drives must provide faster access time in order to optimize speed of I/O operations. In multitasking system with many processes, disk performance can be improved by incorporating a scheduling algorithm for maintaining several pending requests in the disk queue. This paper describes development of a simulator which uses four disk scheduling algorithms (FCFS, SSTF, LOOK for both upward and downward direction, and C-LOOK) to measure their performance in terms of total head movement. Five different types of test samples, containing request tracks from 8 to 50, have been used to obtain simulation results. Developed simulator runs successfully
IJARCSMS
To service a request, a disk system requires that the head be moved to the desired track, then a wait for latency and finally the transfer of data.