Create backup clusters



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Use this task to configure a backup cluster that handles Enterprise JavaBeans (EJB) requests if the primary cluster fails.


Before you begin

Before you begin, create two clusters that are able to provide backup for each other. The objects and resources available in the primary cluster must also be available in the backup cluster. You must use the same cluster name, install the same applications, use the same application names, and define the same resources in the backup cluster as in the primary cluster.

The primary cluster and the backup cluster must reside in separate cells because a cluster must have a unique name within a cell. See Backup clusters for more information.



Perform this task to create a backup cluster for your EJB clusters. When all the servers in the primary cluster fail, work is not halted because the backup cluster can continue serving requests for EJB work.

To configure a backup cluster, specify a name and a port. The port is called a domain bootstrap address and consists of a bootstrap host and port. The bootstrap host is the host that contains the deployment manager in which the backup cluster is configured. The bootstrap port is equal to the bootstrap port for the same deployment manager.

The primary cluster and the backup cluster must reside in separate cells. The bootstrap host and port for the backup cluster determine which cell contains the backup cluster.



  1. Determine the bootstrap host and port of the backup cluster.

    1. Connect the administrative console for the deployment manager that contains the backup cluster.

    2. Click...

      System administration | Deployment manager | Ports | BOOTSTRAP_ADDRESS

      The host and port for the BOOTSTRAP_ADDRESS instance is the host and port that the backup cluster uses. Remember these values for when you configure the primary cluster.

  2. Connect the administrative console to the deployment manager that contains the primary cluster. Click...

    Servers | Clusters | cluster_name | Backup cluster

  3. Ensure that the name of the backup cluster is the same as the primary cluster.

  4. Click Domain bootstrap address. Specify the backup cluster deployment manager bootstrap host and port in the Host and Port fields. Click OK. The bootstrap host and port combined define a bootstrap address for the deployment manager. On the Domain Bootstrap Address page, use the Configuration tab to statically define the backup cluster; the static value is consumed each time the deployment manager starts. You can use the Runtime tab to define the backup cluster during run time only; when the deployment manager stops, the run-time backup cluster information is discarded.

  5. Click OK.

  6. Configure a core group bridge between each of the cluster core groups. Use an access point group to join the two core groups. In the deployment manager for the primary cell, configure an access point group that has a peer access point that refers to the core group access point in the backup cell. In the deployment manager for the backup cell, create an access point group that has the same name as the access point group that you created in the primary cell. Add a peer access point that refers to the core group access point in the primary cell.

    See Configuring communication between core groups that are in different cells for more information.

    Tip: If you are configuring a V5.x cluster to back up a cluster that is on the current release, you do not have to configure the core group bridge service because the V5.x cluster does not belong to a core group. The backup cluster still functions using only the domain bootstrap address.

  7. Save the configuration.



The backup cluster completes EJB requests when the primary cluster fails.


What to do next

If you experience problems when configuring your backup cluster, see Workload is not getting distributed.


See also

Backup clusters
Backup cluster settings


Related Tasks

Balancing workloads with clusters