Creating Clusters with Sites
A Universal Messaging cluster with sites can operate with as few as half of the active cluster members, compared with a required quorum of 51% for a cluster without sites. A cluster with sites includes two sites: a primary site and a backup site. The primary site gets allocated an additional vote to achieve the required cluster quorum of 51%. In a cluster with a production site and a disaster recovery site, you can make either site the primary site, but we recommend that you make the production site the primary site.
For more information about clusters with sites and a discussion on whether to make the production site or the disaster recovery site the primary site, see
About Active/Active Clustering with Sites .
Use the following procedure to create sites for an existing cluster in the Enterprise Manager and to select a primary site.
To create sites for a cluster in the Enterprise Manager
1. Go to Clusters > cluster_name > Sites.
2. On the Sites tab, click New.
3. Specify a name for the site, and then select a realm to add to the site.
The site is displayed on the Sites tab. You can add other cluster realms to the site or remove realms, as required.
4. Repeat the previous two steps to create a second site.
5. In the IsPrime column, select the primary site.