Cluster considerations

Last Updated : Jan 15, 2026 |
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You can deploy Presence Services as a single virtual machine (VM) cluster or a multiple VM cluster. Before deploying Presence Services, consider the following:
  • Single-VM cluster always runs in non-HA mode.
  • Multi-VM cluster always runs in HA mode. Non-HA multi-VM clusters are not supported.
  • A cluster accommodates a maximum of 10 VMs. All VMs in the cluster must have the same Avaya Breeze® platform profile. Refer to the following tables for possible deployments.
  • The number of required VMs depends on the number of presence-enabled users that the cluster hosts. For more information, see Capacity and scalability specification.
  • Avaya Breeze® platform Release 3.5 supports five VM profiles. Each VM profile can have different allocations of CPU, memory, and disk space.
    During Avaya Breeze® platform deployment, you must select Avaya Breeze® platform 3.5 or later with any profile from 3 through 5.
    Note:
    You can deploy Presence Services 10.1 on Avaya Breeze® platform 3.8.1 or later only. Presence Services supports only profiles 3 to 5 of Avaya Breeze® platform 3.6 or later. For more information, see Deploying Avaya Breeze® platform.
    • If Presence Services is the only snap-in deployed on the cluster, select the Avaya Breeze® platform profile based on the number of users that you want to host on this cluster. After you deploy the Avaya Breeze® platform profile, you must modify the hard disk size that is allocated to each Avaya Breeze® platform VM within the cluster.
    • Ensure that the hard disk size is the same for each Avaya Breeze® platform VM within the cluster. For more information, see Modifying the Avaya Breeze® platform VM hard disk size.
  • The Number of users service attribute is used to define the capacity of the cluster. While configuring this attribute, you must specify the expected number of presence-enabled users on the cluster with adequate resources to service the users. For information about administering the number of users, see Configuring number of users for a Presence Services cluster.
    Changing this value requires a restart of the entire cluster, resulting in a service outage.
The following table summarizes the resource allocations of the different Avaya Breeze® platform profiles:
Avaya Breeze® platform profile
Number of vCPUs
CPU Reservation (Mhz)
Memory (GB)
Disk Space (GB)
1
Not supported by Presence Services.
2
Not supported by Presence Services.
3
6
14400
12
150
4
8
19200
18
300
5
12
28000
34
500
Note:
CPU and HDD reservations are in accordance with default Breeze values. They must be adjusted for Presence Services.
The following table summarizes the possible deployments based on the planned number of users:
Note:
Multi-node and highly-available (HA) deployments are supported only on Profile 5.
Planned Number of users
Number of VMs in a non-HA deployment
Number of VMs in an HA deployment
Minimum Avaya Breeze® platform profile
1000
1
Not supported
3
5000
1
Not supported
4
11,000
1
2
5
22,000
Not supported
3
5
33,000
Not supported
4
5
44,000
Not supported
5
5
55,000
Not supported
6
5
65,000
Not supported
7
5
75,000
Not supported
8
5
84,000
Not supported
9
5
168,000
Not supported
18 (two 9-VM clusters)
5
250,000
Not supported
27 (three 9-VM clusters
5
Related links
Modifying the Avaya Breeze platform VM hard disk sizeConfiguring number of users for a Presence Services clusterCapacity and scalability specification