Hierarchical disk cache management in RAID 5 controller

Authors:
Jung-ho Huh;Tae-mu Chang
Affiliations:
Dept. of Computer Engineering, Dongguk University, Seoul, Korea;Dept. of Computer Engineering, Dongguk University, Seoul, Korea
Venue:
Journal of Computing Sciences in Colleges
Year:
2003

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Abstract

In RAID system, disk cache is one of the important elements in improving the system performance. Two-level cache displays superior performance in comparison to single cache and is effective in temporal and spatial locality. The proposed cache system consists in two levels. The first level cache is a set associative cache with small block size whereas the second level cache is a fully associative cache with large block size. In this paper, a RAID 5 disk cache model is presented that is located on a disk controller, which can improve disk input and output time especially in a large capacity disk cache and which can maintain consistency effectively. The aim is to show, in terms of hit ratio and service time, that the two-level cache structure presented in this paper is in fact much improved.