Know about Oracle RAC Heartbeat

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 ) �C IOT
Network Heartbeat ( across the interconnect ) �C misscount
Misscount �C max time a heartbeat can be missed before entering into a cluster reconfig to evict a node
IOT �C 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)
oracle_crs_heartbeats

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