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oracle ocfs2 cluster filesystem best practise

May 21st, 2013
  • To check current settings of o2cb, check files underĀ /sys/kernel/config/cluster/ocfs2/
  • To set new value for o2cb:

service o2cb unload
service o2cb configure

heartbeat dead threshold 151 #Iterations before a node is considered dead
network idle timeout 120000 #Time in ms before a network connection is considered dead
network keepalive delay 5000 #Max time in ms before a keepalive packet is sent
network reconnect delay 5000 #Min time in ms between connection attempts

service o2cb load

service o2cb status #will show new configuration if OVS in server pool; or it will show offline


o2cb - Default cluster stack for the OCFS2 file system, it includes
  • a node manager (o2nm) to keep track of the nodes in the cluster,
  • a heartbeat agent (o2hb) to detect live nodes
  • a network agent (o2net) for intra-cluster node communication
  • a distributed lock manager (o2dlm) to keep track of lock resources
  • All these components are in-kernel.
  • It also includes an in-memory file system, dlmfs, to allow userspace to access the in-kernel dlm
  • main conf files: /etc/ocfs2/cluster.conf, /etc/sysconfig/o2cb
  • more info hereĀ https://oss.oracle.com/projects/ocfs2-tools/dist/documentation/v1.4/o2cb.html
Good Luck!

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