In my dissertation, Data availability of redundant maintenance of the replication and erasure codes are analyzed. The mathematical model of storage node failure and repairing is proposed and the reliability of the storage node is analyzed. 针对分布式存储系统存储节点的不稳定性,分析了复制和纠删码冗余维护的数据文件可用性,给出了存储节点失效与修复的数学分布,从而计算出存储节点的可靠性模型。
DDRM has lower data failure probability comparing with double-replica and greater availability comparing with erasure codes stragegy. ( 3 ) Data buffer is a key strategy that can be used to overcome the instability of the network. 数据恢复模型较双副本存储具有更低的数据失效概率,较纠删码策略具有更强的易用性。(3)为了克服网络的不稳定性,数据缓存是网络应用较为常用的一个主要策略。