Know about Oracle RAC Heartbeat

weixin_34192816

于 2013-03-19 00:47:00 发布

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文章标签：嵌入式数据库

本文详细介绍了Oracle RAC集群中的心跳机制，包括Disk Heartbeat和Network Heartbeat两种类型及其超时设置。Disk Heartbeat通过投票磁盘进行内部I/O操作，而Network Heartbeat则通过网络连接发送心跳信号。此外，还解释了miss count与I/O timeout的概念及其阈值设定。

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Oracle CRS的心跳主要分为Disk和Network Heartbeat，不同种类的心跳超时会对RAC造成不同的影响。

Heartbeat Mechanisms

Disk Heartbeat ( Voting device ) – IOT
Network Heartbeat ( across the interconnect ) – misscount
Misscount – max time a heartbeat can be missed before entering into a cluster reconfig to evict a node
IOT – internal I/O timeout, in seconds where an I/O to the disk must complete
IOT = misscount [ during initial cluster formation time]
IOT = disktimeout [ all other times ] 

Hardware Storage timeout
Software Storage timeout
OCFS Heartbeat timeouts

disktimeout > max(O2CB_HEARTBEAT_THRESHOLD * 2, HW_STORAGE_TIMEOUT, SW_STORAGE_TIMEOUT)