Oracle Linux: Set an Appropriate Value of OCFS2 Disk Heartbeat to Prevent Nodes Fencing During HA Storage System Controllers Failover
Last updated on SEPTEMBER 15, 2016
Applies to:Linux OS - Version Oracle Linux 5.5 and later
Oracle Exalytics Software - Version 22.214.171.124.0 to 126.96.36.199.0 [Release 1.0]
With Storage System Controllers in HA (High Availability) pair, connection to LUNs might be temporarily lost during a Controller failover event, which can take up to five minutes till fully recovery.
An unforeseen value of OCFS2 Disk Heartbeat might incidentally cause nodes fencing.
To avoid o2hb fencing during a Controller failover event, it is recommended to enlarge the value of O2CB_HEARTBEAT_THRESHOLD in accordance to Storage System vendors (EMC, NetAPP, HP, ZFSSA, etc.) recommendation, though in our experiences five minutes has handled most of these events.
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