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Oracle RAC is rebooting boxes in the cluster, how do I determine why from the OS side?

Solution Verified - Updated 2014-02-04T13:40:42+00:00 -

Issue

Oracle RAC is rebooting servers in the cluster. There are node evictions and we think that resource contention may be the cause. This can be replicated. Asking for help on what to look for? Extra logging to turn on? Etc. Oracle is pointing to messages in /var/log/messages (mpp errors, port teaming errors) as the cause. Looking for root cause of the reboots and node evictions.
Server Auto Rebooted, need to determine root cause.

Environment

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5
Oracle RAC Cluster Suite

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