磁盘冗余阵列技术的主要目的是为了 （） 。
- A.提高磁盘存储容量
- B.提高磁盘容错能力
- C.提高磁盘访问速度
- D.提高存储系统的可扩展能力
正确答案及解析
正确答案
解析
计算机采用磁盘冗余阵列（RAID）技术，可以提高磁盘数据的容错能力。使用这种技术，当计算机硬盘出现故障时，可保证系统的正常运行，让用户有足够时间来更换故障硬盘。RAID技术分为几种不同的等级，分别可以提供不同的速度、安全性和性价比。根据实际情况选择适当的RAID级别可以满足用户对存储系统可用性、性能和容量的要求。常用的RAID级别有NRAID、RAID0、RAID1、RAID0+1、RAID3和RAID5等。目前经常使用的是RAID5和RAID（0+1）。
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