进化存储系统中的物理进化

系统整体结构不能很好地适应系统磁盘的动态变化，这是现有存储系统中普遍存在的一个问题。而我们提出的进化存储系统ERAID（Evolving RAID system）是一个动态存储系统，能够在不停止系统I／O服务的前提下，采用DAA、HDAA、e-HDAA算法分别实现存储系统中同构磁盘的添加、异构磁盘的添加以及异构磁盘的替换,即实现存储系统的物理进化。仿真实验结果表明：在较小的系统开销下，DAA、HDAA、e-HDAA算法能逐渐吸收添加或替换到ERAID系统的（同构或异构）磁盘，使ERAID系统获得优化的存储客量和存储性能。

Physical Evolution in ERAID System

The system architecture cannot adapt to the dynamic change of system disks, which is a general problem in traditional storage system. While ERAID system we proposed is a dynamic storage system. To implement the physical evolution of ERAID system, it applies DAA, HDAA, e-HDAA algorithms to cope with the situations of homogeneous disk adding, heterogeneous disk adding, and heterogeneous disk replacement respectively, without stopping the system I/O service. Simulation results demonstrate that through applying DAA, HDAA, e-HDAA algorithms, ERAID system can assimilate the adding/replacing homogeneous/heterogeneous disks gradually with little extra system overhead, and achieve optimized storage capacity and I/O performance.