服务虚拟化使用分布式存储，与集中共享储存相比，分布式存储（ ）。
- A.虚拟机磁盘IO性能较低
- B.建设成本较高
- C.可以实现多副本数据冗余
- D.网络带宽要求低
正确答案及解析
正确答案
解析
实际硬件环境中，磁盘可能损坏，服务器可能宕机，网络可能失效……为处理这些不可预期的硬件故障，保证数据的完整性和业务的可用性，需要通过全冗余设计等一系列软件层面的设计，来弥补硬件不可靠带来的数据可靠性和可用性问题。
分布式存储采用了多副本冗余机制，基于策略配置，实现数据及其副本跨硬盘、跨存储节点、跨机架的存储，并通过强一致性复制技术确保各个数据副本的一致性，这样即便一个数据服务器甚至整个机架停机也完全不影响数据可靠性和可用性。
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