UIS两副本三节点部署,若两个节点同时坏硬件,对业务有影响吗?
UIS两副本三节点部署,若果两个节点同时坏硬件,对业务有影响吗,如果有影响,请问依据是什么呢?
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最佳答案
三副本的最小工作副本数是二,两副本的最小工作副本数是一,当数据满足最小工作副本数时,集群可以正常对外提供服务;若存在有数据小于最小工作副本数时,集群会暂停对外服务。所以三副本的场景下,故障一个副本,集群可以正常工作,若在未完全恢复前又故障了一个副本,集群将无法对外提供服务,但数据不会丢失。二副本的情况下,故障一个副本,可以对外提供服务,若在未完全恢复前又故障了一个副本,集群将无法对外提供服务,数据也会丢失。
所以两副本的情况下,存在数据丢失的风险。建议两副本改三副本,且由于两副本改三副本会占用较大读写IO,所以建议离线操作!
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