EvoRAID: Adaptation to Dynamic Change of Disks in Storage System

The system architecture cannot adapt to the dynamic change of system disks, which is a general problem in traditional storage system. While EvoRAID system, a dynamic storage system we proposed, applies DAA algorithm to cope with three kinds of storage system disk changes - homogeneous disk adding, heterogeneous disk adding, and heterogeneous disk replacement. Simulation results demonstrate that without stopping system I/O service, EvoRAID system can assimilate the adding/replacing homogeneous/heterogeneous disks gradually with little extra system overhead, and achieve optimized storage capacity and I/O performance.