It becomes a big issue of reducing power consumption in storage systems corresponding to the increase of the energy consumption in a data center. We have proposed a method for reducing the power consumption in storage systems named RAPoSDA(Replica Assisted Power Saving Disk Array), and also roughly estimated the power consumption effect of it. But we could not verify the actual performance and effect of the power reduction for the given workload. To evaluate the performance and effect of the power reduction on actual workload, we are now developing a dedicated simulator. In this paper, we describe the configuration of simulator of the RAPoSDA.