Review of Disk Scheduling Algorithms and RAID Levels

Disk performance management is an important aspect of operating system research and development. One of the main purposes of the operating system for the disk drives is to use the hardware efficiently. So 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. In this paper we perform an experimental study on disk scheduling algorithms which attempt to optimize head movements and guarantees fairness in response time. Various 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. An important aspect of disk organization scheme to improve the disk reliability. So the different RAID levels help to maintain data consistency on disk. This paper also describes the summary of different scheduling algorithms and RAID levels.