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(Oracle VM) Configuring the O2CB_HEARTBEAT_THRESHOLD

When you run Oracle VM with multipathing in a clustered host environment, you need to configure the O2CB_HEARTBEAT_THRESHOLD to 65.

About this task

This timeout value works with the I/O layer and sets the maximum amount of time in seconds that a node waits for an I/O operation. In the heartbeat system file, the node writes to the block every two seconds. The block offset is equal to its global node number. This means that node 0 writes to the first block, node 1 to the second block, and so on. All the nodes also read the heartbeat sysfile every two seconds. As long as the timestamp keeps changing, that node is considered "alive."

Steps

  1. On each hypervisor, run the command: service o2cb configure
  2. Set O2CB_HEARTBEAT_THRESHOLD to 65 by entering: O2CB_HEARTBEAT_THRESHOLD = 65
    Heartbeat settings and multipath settings should be exactly same on all the hypervisors in a server pool.
  3. Either restart the O2CB service or reboot your system.