Installation guide

Note

The failback characteristic is applicable only if ordered failover is configured.

Note

Changing a failover domain configuration has no effect on currently running services.

Note

Failover domains are not required for operation.

By default, failover domains are unrestricted and unordered.

In a cluster with several members, using a restricted failover domain can minimize the work to set up

the cluster to run a cluster service (such as httpd ), which requires you to set up the configuration

identically on all members that run the cluster service. Instead of setting up the entire cluster to run

the cluster service, you can set up only the members in the restricted failover domain that you

associate with the cluster service.

Note

To configure a preferred member, you can create an unrestricted failover domain comprising

only one cluster member. Doing that causes a cluster service to run on that cluster member

primarily (the preferred member), but allows the cluster service to fail over to any of the other

members.

To configure a failover domain, use the following procedures:

1. Open /etc/cl uster/cl uster.co nf at any node in the cluster.

2. Add the following skeleton section within the rm element for each failover domain to be used:

<failoverdomain name="" nofailback="" ordered=""

restricted="">

</failoverdomain>

</failoverdomains>

Red Hat Ent erprise Linux 6 Clust er Administ rat ion

116