If you deploy IM and Presence Service with IM-only users, you can increase the number of users per OVA. For example, if you deploy a 5000 user OVA with 1000 full Unified Communications (UC) users, then the remaining space for 4000 users can be multiplied by 1.67 to determine the maximum number of IM-only users, as follows:
|Full UC users
|Maximum number of IM-only users (4000 x 1.67)
|Total users for this example
(Full UC users and IM-only users)
The formula for calculating the total number of full UC users and IM-only users within a deployment is as follows:
(full UC users) + ((total OVA users - full UC users) x 1.67) = total supported users
If you are deploying two or more nodes in your IM and Presence Service installation, use the IM and Presence Service multi-node feature and ensure that your hardware and OVA are compatible with this feature. This is necessary for both a fresh installation and an upgrade of IM and Presence Service.
See the Configuration and Administration of IM and Presence Service on Cisco Unified Communications Manager for more information about specific multi-node deployment strategies and hardware support information for a multi-node deployment.