2-D tiles pair of base vectors twice mapping declustering method
Aiming at the performance difference of real storage devices in object-based storage system,a 2-D tiles pair of base vectors twice mapping declustering method based on virtual device is proposed.Firstly,a group of virtual devices which have same storage performance and non-limited capacity is constructed,then the tiles are distributed into M virtual devices according to the distribution model of 2-D tiles pair of base vectors.Secondly,the tiles are equably mapped in M virtual devices into M equidis tant intervals in [0,1) using pseudo-random number generator.Finally,[0,1) is divided into M intervals according to the tiles distribution percentage of every real device,and the tiles in each interval are distributed in the corresponding real device.