Red Hat CLUSTER FOR ENTERPRISE LINUX 5.0, Configuration Manual

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Note
Using JBOD as a quorum disk is not recommended. A JBOD cannot provide
dependable performance and therefore may not allow a node to write to it quickly
enough. If a node is unable to write to a quorum disk device quickly enough, the
node is falsely evicted from a cluster.
6. Multicast Addresses
Red Hat Cluster nodes communicate among each other using multicast addresses. Therefore,
each network switch and associated networking equipment in a Red Hat Cluster must be
configured to enable multicast addresses and support IGMP (Internet Group Management
Protocol). Ensure that each network switch and associated networking equipment in a Red Hat
Cluster are capable of supporting multicast addresses and IGMP; if they are, ensure that
multicast addressing and IGMP are enabled. Without multicast and IGMP, not all nodes can
participate in a cluster, causing the cluster to fail.
Note
Procedures for configuring network switches and associated networking
equipment vary according each product. Refer to the appropriate vendor
documentation or other information about configuring network switches and
associated networking equipment to enable multicast addresses and IGMP.
7. Considerations for Using Conga
When using Conga to configure and manage your Red Hat Cluster, make sure that each
computer running luci (the Conga user interface server) is running on the same network that
the cluster is using for cluster communication. Otherwise, luci cannot configure the nodes to
communicate on the right network. If the computer running luci is on another network (for
example, a public network rather than a private network that the cluster is communicating on),
contact an authorized Red Hat support representative to make sure that the appropriate host
name is configured for each cluster node.
8. General Configuration Considerations
You can configure a Red Hat Cluster in a variety of ways to suit your needs. Take into account
the following considerations when you plan, configure, and implement your Red Hat Cluster.
Chapter 2. Before Configuring a Red Hat Cluster
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