rac oracle脑裂,RAC 脑裂处理机制 Oracle RAC Brain Split

weixin_39721000

于 2021-04-06 21:02:55 发布

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文章标签： rac oracle脑裂

当集群的私有网络发生中断，节点间无法通过私有网络通信，此时会触发‘脑裂’现象。为解决此问题，集群使用投票磁盘来决定哪些节点存活，哪些被剔除。通常情况下，节点数量较多的组将存活，如果各组节点数相同，则负载较低的节点更有可能存活，尤其是在高系统负载导致剔除时。

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Cluster nodes maintain their heartbeat via private network and voting disk. When there is a private network disruption, cluster nodes can not communicate to each other via private network for the time period of misscount setting, split brain will happen. In such case, voting disk will be used to determine which node(s) survive and which node(s) will be evicted. The common voting result will be:

a. The group with more cluster nodes survive

b. The group with lower node member in case of same number of node(s) available in each group

c. Some improvement has been made to ensure node(s) with lower load survive in case the eviction is caused by high system load.