Hi Ross,
Please have a look into Docwiki if it helps
http://docwiki.cisco.com/wiki/Virtualization_for_Unified_CM_IM_and_Presence#Notes_on_1000_user_VM_configuration
Number of “Jabber for Everyone” users = (Number of full UC users/Maximum number of full UC users) x
Maximum number of “Jabber for Everyone” users
For example, if you have 10,000 full UC users on a server that supports a maximum of 15,000 users, then
you are operating at 2/3 of the scale for UC, which means that 1/3 is available for “Jabber for Everyone” users.
The IM and Presence Service supports 25,000 users for IM-only mode, therefore, you can add 8,333 users
(25,000 x 1/3) through “Jabber for Everyone”. This amounts to a total of 18,333 users.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/9x/presence.html
this is table 23.4 for above link
Cisco IM and Presence Service Platforms and Number of Users Supported
Server Platform | Users Supported Per Platform in Full Unified Communications Mode | Users Supported Per Platform in Instant Messaging Only Mode |
---|
Cisco MCS 7816 | 3,000 | 7,500 |
Cisco MCS 7825 | 6,000 | 15,000 |
Cisco MCS 7835 or OVA equivalent | 15,000 | 37,500 |
Cisco MCS 7845 or OVA equivalent | 45,000 | 75,000 |
regds,
aman