By default, a fenced node in an OCFS2 cluster restarts instead of panicking so that it
can quickly rejoin the cluster. If the reason for the restart is not apparent, you can
change the node's behavior so that it panics and generates a vmcore
for
analysis.
To configure a node to panic when it next fences, run the following command on the node after the cluster starts:
# echo panic > /sys/kernel/config/cluster/cluster_name
/fence_method
where cluster_name
is the name of the cluster. To set the
value after each reboot of the system, add this line to /etc/rc.local
. To
restore the default behavior, set the value of fence_method
to
reset
instead of panic
and remove the line from
/etc/rc.local
.
For more information, see Section 21.3.5, “Configuring the Behavior of Fenced Nodes”.