DSUraid5 Data Layout Method for Heterogeneous Disk Array
Jun Zhou · Jisuanji gongcheng · 2008
By analyzing the existed data layout algorithm of heterogeneous disk array, this paper proposes a new method called Dynamic Stripe Unit(DSU) raid level 5. This method assigns the stripe unit size according to the performance parameter of each disk, and resolves the problem of counting and placing parity unit by mirroring the heterogeneous disk array to virtual homogenous disk array. Through combining the dynamic stripe unit and left-symmetric parity distribution, the algorithm makes the load balanced or near balanced. Simulation results show that the algorithm has higher performance than raid5 at most 40%, and is adapt to multiple applications.