Choosing the right scheduler

The sole purpose of I/O schedulers is to optimize disk access requests. There are some common techniques used by schedulers, such as merging I/O requests that are adjacent on disk. The idea is to avoid frequent trips to the physical storage. Aggregating requests that are situated in close proximity on the disk reduces the frequency of the drive’s seeking operations, thereby enhancing the overall response time of disk operations. I/O schedulers aim to optimize throughput by rearranging access requests into sequential order. However, this strategy may cause some I/O requests to wait for an extended time, resulting in latency problems in certain situations. I/O schedulers strive to achieve a balance between maximizing throughput and distributing I/O requests equitably among all processes. As with all other things, Linux has a variety of I/O schedulers available. Each has its own set of strengths:

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