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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
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