Solid state cache management scheme for improving I/O performance of hard disk drive

摘要

In this paper, we propose the HyU 2Level-LRU (Hybrid Unit 2Level-LRU) scheme to optimize the slow input/output speed of the HDD. We minimized disk access and increased the cache hit rate by frequently accessing the pages in the SSC. In addition, we minimized disk head movement by maintaining the adjacent pages requested to write in a group when the pages are destaged to the HDD. Depending on the read requests workload, the cache hit ratio can be improved if there are more pages frequently accessed to read than to write. On the other hand, if the workload has many write requests, it can be minimized if the frequently accessed pages are rewritten in the SSC as soon as they are destaged to the HDD by caching more write requested pages. Therefore, we also propose a scheme that manages pages flexibly in a variety of workloads. In this paper, we will describe these techniques and discuss the results of experiments using SSD and HDD.