Configuring a Cluster for High Availability

Before starting this section, you must have created one or more Application Server clusters. For information on how to create a cluster, see To Create a Cluster.

From the machine on which the Domain Administration Server is running, configure the cluster to use HADB using this command:

asadmin configure-ha-cluster --user admin --hosts hadb_hostname1,hadb_hostname2 [,...] --devicesize 256 clusterName

Where hadb_hostname1, hadb_hostname2, and so on, are the host names of the machines where HADB is running, and clusterName is the name of the cluster. For example:

asadmin configure-ha-cluster --user admin --hosts host1,host2,host1,host2 --devicesize 256 cluster1

This example creates two nodes on each machine, which are highly available even in case of HADB failover. Note that the order of the host names following the –hosts option is significant, so the previous example would be different than --hosts host1,host1,host2,host2.

If you are using just one machine, you must provide the host name twice.