How To Configure OCFS2 To Generate A VMCORE When The Server Is Evicted By The OCFS2 Fence Method.
Last updated on DECEMBER 28, 2017
Applies to:Linux OS - Version Oracle Linux 6.0 and later
The main purpose of this document is to explain how to configure the server to collect a vmcore when the server is rebooted/evicted by the OCFS2 Fence Method.
By default the OCFS2 Fence Method is set to "reset" this means the server will be only rebooted when this is evicted by the OCFS2 mechanism and the vmcore will not be collected at all.
This change will force the server to create a memory dump whenever this is evicted by OCFS2, servers can be evicted by OCFS2 when any of the heartbeats are lost, OCFS2 will desired what is the proper or most accurate server to be rebooted in order to recover this issues, this is why this change will need to be applied in all servers of the cluster in order to be prepared for any event or even configure this on the problematic server as soon as we determine which one is being rebooted to collect additional data for proper troubleshooting process.
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