From this, is there a way to determine the cause ? kdump is not confirgured nor used, since the fencing of the node renders kdump useless.
This is the second time in a few weeks it happens.
/var/log/messages should have more information; could you include it?
No, unfortunently, the last message in the log is a normal one, an after that it's the boot process.
I will look at netconsole as Ross suggested.
Regards,