Installation guide

and corrupting it. It is strongly recommended that fence devices (hardware or software

solutions that remotely power, shutdown, and reboot cluster nodes) are used to guarantee

data integrity under all failure conditions. Watchdog timers provide an alternative way to to

ensure correct operation of cluster service failover.

Ethernet channel bonding

Cluster quorum and node health is determined by communication of messages among

cluster nodes via Ethernet. In addition, cluster nodes use Ethernet for a variety of other

critical cluster functions (for example, fencing). With Ethernet channel bonding, multiple

Ethernet interfaces are configured to behave as one, reducing the risk of a

single-point-of-failure in the typical switched Ethernet connection among cluster nodes and

other cluster hardware.

Chapter 2. Before Configuring a Red Hat Cluster