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The DEF Algorithm in RAID5

Changsheng Xie

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Abstract

Destage algorithms play an important role in improving IO performance in cached RAID5 systems.In this paper,the authors study a number of existing destage algorithms,and propose a destage-efficiency-first(DEF) algorithm based on the classification of system status for RAID5 systems.The main idea of this algorithm is that destage strategy will be dynamically adjusted on the principle of detage efficiency according to the current cache occupancy level and varying workload.In addition,the authors present the key technology in implementing the DEF algorithm,and test and analyse the performance of the algorithm.

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What this paper is about

Destage algorithms play an important role in improving IO performance in cached RAID5 systems.In this paper,the authors study a number of existing destage algorithms,and propose a destage-efficiency-first(DEF) algorithm based on the classification of system status for RAID5 systems.The main idea of this algorithm is that destage strategy will be dynamically adjusted on the principle of detage efficiency according to the current cache occupancy level and varying workload.In addition,the authors present the key technology in implementing the DEF algorithm,and test and analyse the performance of the algorithm.

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Available abstract

Destage algorithms play an important role in improving IO performance in cached RAID5 systems.In this paper,the authors study a number of existing destage algorithms,and propose a destage-efficiency-first(DEF) algorithm based on the classification of system status for RAID5 systems.The main idea of this algorithm is that destage strategy will be dynamically adjusted on the principle of detage efficiency according to the current cache occupancy level and varying workload.In addition,the authors present the key technology in implementing the DEF algorithm,and test and analyse the performance of the algorithm.

Key concepts: Computer science, Algorithm, Workload, Cache, Key (lock), Parallel computing, Operating system

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