Abstract: Due to the limitation of traditional RAID technology, traditional RAID can no longer meet the stringent requirements of storage. RS-RAID（Reed Solomon RAID） can ensure a higher reliability and space utilization. But poor I/O and recovery performance still exist. A RS-RAID, which accelerates the calculation speed by using Intel ISA-L（Intelligent Storage Acceleration Library） and reduces the time of data recovery by using valid data bitmap, which makes RS-RAID recover the valid data only, can solve these problems. With these steps, RAID system becomes more reliable and more efficient.

Key words: Intel Intelligent Storage Acceleration Library（ISA-L）, high reliability, Reed Solomon code, Reed Solomon-Redundant Arrays of Independent Disks（RS-RAID）, valid bitmap

摘要： 由于传统RAID技术自身的局限性，导致其难以在更高的可靠性、I/O性能以及存储空间利用率之间取得良好的平衡。RS-RAID（Reed Solomon RAID）能够提供更高的可靠性，并且具有较高的存储空间利用率，但仍存在I/O性能低和数据恢复时间长的重要问题。基于Intel ISA-L的RS-RAID通过使用Intel ISA-L库加速RS码的计算速度，提高了RS-RAID的I/O性能;通过使用有效数据bitmap记录磁盘中实际需要恢复的数据，减少了RS-RAID在数据恢复过程中需要恢复的数据量，从而降低了RS-RAID的数据恢复时间。

关键词: Intel 智能存储加速库, 高可靠, Reed Solomon码, 采用RS码的纠删码RAID系统（RS-RAID）, 有效数据bitmap