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37.3. Fencing


Fencing nodes in a cluster is implemented to isolate a malfunctioning node from the rest of a cluster. This is important to prevent the scenario where a malfunctioning node assumes the rest of a the cluster is in error, and tries to fail over the cluster to the malfunctioning node. This scenario could create a race condition and cause extensive data corruption.
While HornetQ can operate in a fenced environment, configuration varies depending on what fencing agent you choose, and how the fencing agent is configured.
If your server cluster is running on Red Hat Enterprise Linux, Red Hat provides fencing support through the High Availability Add-On. You must have an entitlement to use this product in the Customer Support Portal .
For detailed information about configuring fencing using the High Availability Add-On, refer to the Red Hat Enterprise Linux Cluster Administration Guide for the version of Red Hat Enterprise Linux installed on your cluster infrastructure. The sections "Configuring Fence Devices", and "Configuring Fencing for Cluster Members" will help you configure fencing correctly.
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