Capacity and scalability specification

Last Updated : Mar 12, 2026 |
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Capacity and scalability specification
Endpoint mode
Max. no. of users
Max. no. of devices
Max. avg. no. of contacts per user
Default max. contacts per user
Max. no. of subscriptions/ minute/server
Max. no. of presence updates per second/server
Max. no. of XMPP IMs per second/server
SIP
Up to 11,000 on a single server, 84,000 on a 9-VM clusterClustered deployments of Presence Services are limited to a maximum of 9 VMs in a cluster and all VMs in the cluster must reside on the same subnet. A total of 168,000 users can be supported if two 9–VM clusters are deployed, and 250,000 users can be supported if three 9-VM clusters are deployed. For cluster deployments all VMs in the cluster must use the same resource profile: 12 vCPUs, 34 GB of RAM, and 28,800 Mhz of CPU reservation., 168,000 on dual 9–VM cluster, and 250,000 on triple 9–VM cluster1
117,000 on a single cluster, 235,000 on a dual cluster, and 350,000 on a triple clusterWhen the Multi-Device Access feature is used, Presence Services can support an average of 1.4 devices per user for a maximum total of 117,000 devices per cluster or 350,000 devices per Aura system with maximum of three 9– VMPresence Services clusters.
40
100By default, the maximum number of contacts permitted per user is 100. This option is configurable and the maximum can be increased but a fully-loaded Presence Services system can only support an average of 40 contacts per user.
300
30
44
H.323 (XMPP)
Up to 11,000 on a single VM, 84,000 on a 9–VM cluster1, 168,000 on dual 9–VM cluster, and 250,000 on triple 9–VM cluster1
84,000 on a single 9–VM cluster, 168,000 on a dual 9–VM cluster, and 350 on a triple 9–VM cluster2
40
1003
300
30
44
Capacity and scalability specification
Feature
Restriction
Application Enablement Services Collector
You can configure 4000 station monitors for each collector.
You can configure a maximum of 32,000 stations for each Presence Services cluster.
IBM Domino Collector
You can configure 11,000 users for each collector.
Each collector can only communicate with a single Domino server.
Microsoft Exchange Collector
You can configure 11,000 users for each collector.
Each collector can only communicate with a single Exchange cluster.
Clustering
You can configure a maximum of 9 VMs and a maximum of two clusters for each cluster System Manager.
High Availability
  • Up to 11,000 users: total of 2 VMs in the cluster
  • Up to 22,000 users: total of 3 VMs in the cluster
  • Up to 33,000 users: total of 4 VMs in the cluster
  • Up to 44,000 users: total of 5 VMs in the cluster
  • Up to 55,000 users: total of 6 VMs in the cluster
  • Up to 65,000 users: total of 7 VMs in the cluster
  • Up to 75,000 users: total of 8 VMs in the cluster
  • Up to 84,000 users: total of 9 VMs in the cluster
  • Up to 168,000 users: total of 18 VMs, two clusters of 9 VMs each
  • Up to 250,000 users: total of 27 VMs, three clusters of 9 VMs each
When High Availability is deployed, the additional servers are used for normal service as the cluster supports active-active High Availability protection and balances the load to all servers.
High Availability provides fault protection for single server failures only. Cascading failures are not protected.
Note:
For scaling out to the maximum supported user capacities with multiple clusters, only fully utilized clusters are supported. For example, support of less than 84,000 users is not supported on two or three clusters of any number of nodes. 84,000 users is only supported on a single cluster of 9 nodes.
Similarly, support of less than 168,000 users is not supported on three clusters of any number of nodes. 168,000 users is only supported by two clusters of 9 nodes each.
Additionally:
  • Support of two clusters is not supported until the first cluster has reached its maximum capacity of 84,000 users on 9 nodes.
  • Support of three clusters is not supported until the first two clusters have reached their maximum capacity of 168,000 users.