When you install multiple copies of Management & Control Services (MCS) creating a server cluster each member of the cluster is assigned an initial priority. The server with the highest priority in the cluster acts as the primary server. If for some reason that server goes down, the server with the next highest priority in the cluster takes over primary server responsibilities. If you need to re-prioritize the servers in a cluster after installation, you can do so using the procedure below.
For example, if you have three additional servers in a cluster, you should make sure the best available server is assigned the highest priority, in case it needs to someday take over the role of the primary server.
|To change the priority of a server in an MCS server cluster|
|Regardless of the server you access for viewing the MCS console, you are redirected to the primary server in the cluster. Any changes you make in the user interface are written to the primary server, and then replicated to other servers in the cluster.
If you change the priority of your primary server, it can take several seconds for the new primary server to take over primary server responsibilities. You should not make any other changes, such as adding a user to the MCS directory or creating a new ID pool, before the new server has taken over. You can monitor the change in the Viewer, General page (Services | Server Management | Viewer). Under Status, the primary server (priority 0) displays the information "OK - Primary." Other servers display only "OK" or "Unknown."
If you wait about 30 seconds or until you see the change in the Viewer - General page, and then refresh your browser before making other changes, you will be automatically redirected to the new primary. If you do not wait, your changes will be written to the server that was primary before you reprioritized, and the next time data is replicated from the new primary server, your data will be overwritten.
|Managing MCS Servers and Clusters, Overview|
|Data Replication and Failover Protection|
|Viewing Server Information|
|Removing a Server from a Cluster|