Disk Prefetching Using Blocks' Association Rules

Modern applications, especially I/O-bound workload such as Online Transaction Processing(OLTP) often suffer from the performance gap between processor and I/O devices. Too much time is wasted waiting for the I/O operations. And there seems little evidence that the gap will stop widening in the near future. In this paper, a novel disk prefetching scheme is proposed. This prefetcher utilizes the blocks’ association rules that are recognized as semantic information embedded in disk I/O traces. The experimental results show that the proposed scheme can satisfy the demand for real-time response to I/O stream and the I/O performance can be effectively increased.

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