Cisco Cisco E-Mail Manager Unity Integration Option Fascicule
11-6
Cisco Unified Contact Center Enterprise 7.5 SRND
Chapter 11 Sizing Cisco Unified Communications Manager Servers
Cluster Guidelines and Considerations
Cisco Unified Communications Sizing Tool
The Cisco Unified Communications Sizing Tool (Unified CST) can help you quickly and accurately size
large and complex Unified Communications Systems. This tool supports sizing of many Unified
Communications components, such as Unified CM, Unified CCE, Unified IP IVR, Unified CVP,
gateways, and Expert Advisor.
large and complex Unified Communications Systems. This tool supports sizing of many Unified
Communications components, such as Unified CM, Unified CCE, Unified IP IVR, Unified CVP,
gateways, and Expert Advisor.
The Cisco Unified Communications Sizing Tool is available to Cisco employees and Cisco partners.
Refer to the documentation for this tool for more details and instructions.
Refer to the documentation for this tool for more details and instructions.
Cluster Guidelines and Considerations
The following guidelines apply to all Unified CM clusters with Unified CCE.
Note
A cluster may contain a mix of server platforms, but is strongly discouraged except in migration/upgrade
scenarios. All primary and failover backup server pairs must be of the same type. All servers in the
cluster must run the same Unified CM software release and service pack.
scenarios. All primary and failover backup server pairs must be of the same type. All servers in the
cluster must run the same Unified CM software release and service pack.
•
Within a cluster, you may enable a maximum of 8 servers with the Cisco CallManager Service,
including backup servers. Additional servers may be used for more dedicated functions such as
TFTP, publisher, music on hold, and so forth.
including backup servers. Additional servers may be used for more dedicated functions such as
TFTP, publisher, music on hold, and so forth.
•
You can configure a maximum of 2,500 CTI monitored devices (for example, logged-in agent
phones, agent phones not logged in, CTI Route Points, CTI ports, agent phones monitored by a
recording application via JTAPI, and soft clients in a desk phone mode using CTI third-party call
control) per Cisco MCS-7845 server. This means a maximum of 10,000 CTI monitored devices per
cluster. Beginning with Cisco Unified CM 7.1(2), the CTI capacity limits have been increased and
the Cisco MCS-7845-H2/I2 supports 3,375 CTI devices per server or 13,500 devices per cluster.
These capacities can vary, depending on your specific deployment. All deployments must be sized
by using the Cisco Unified CM Capacity Tool or the Cisco Unified Communications Sizing Tool.
The BHCA of the CTI monitored or controlled devices entered in the Unified CM Capacity Tool or
the Unified Communications Sizing Tool should also reflect a consistent call arrival rate, with only
small variations or peaks (no more than 20%) around the average calls per second.
phones, agent phones not logged in, CTI Route Points, CTI ports, agent phones monitored by a
recording application via JTAPI, and soft clients in a desk phone mode using CTI third-party call
control) per Cisco MCS-7845 server. This means a maximum of 10,000 CTI monitored devices per
cluster. Beginning with Cisco Unified CM 7.1(2), the CTI capacity limits have been increased and
the Cisco MCS-7845-H2/I2 supports 3,375 CTI devices per server or 13,500 devices per cluster.
These capacities can vary, depending on your specific deployment. All deployments must be sized
by using the Cisco Unified CM Capacity Tool or the Cisco Unified Communications Sizing Tool.
The BHCA of the CTI monitored or controlled devices entered in the Unified CM Capacity Tool or
the Unified Communications Sizing Tool should also reflect a consistent call arrival rate, with only
small variations or peaks (no more than 20%) around the average calls per second.
•
In a deployment with IP IVR, each Unified CM cluster (four primary and four backup subscriber
servers) can support up to approximately 2,000 Unified CCE agents. This limit assumes that the
BHCA call load and all configured devices are spread equally among the eight call processing
servers with 1:1 redundancy. (See
servers) can support up to approximately 2,000 Unified CCE agents. This limit assumes that the
BHCA call load and all configured devices are spread equally among the eight call processing
servers with 1:1 redundancy. (See
, for redundancy schemes.)
Each of the eight Unified CM servers (MCS-7845 High Performance Servers) would support a
maximum of 250 agents. In a failover scenario, the primary server would support a maximum of 500
agents. These capacities can vary, depending on your specific deployment. All deployments must be
sized by using the Cisco Unified CM Capacity Tool or the Unified Communications Sizing Tool.
Some deployments with more than 500 agents per pair of subscriber nodes or 2000 agents per cluster
might be supported, depending upon the output of the Unified CM Capacity Tool or the Unified
Communications Sizing Tool.
maximum of 250 agents. In a failover scenario, the primary server would support a maximum of 500
agents. These capacities can vary, depending on your specific deployment. All deployments must be
sized by using the Cisco Unified CM Capacity Tool or the Unified Communications Sizing Tool.
Some deployments with more than 500 agents per pair of subscriber nodes or 2000 agents per cluster
might be supported, depending upon the output of the Unified CM Capacity Tool or the Unified
Communications Sizing Tool.
•
In a deployment with Unified CM 7.0 and Unified CVP (no IP IVR), each Unified CM cluster (four
primary and four backup subscriber servers) can support up to about 4,000 Unified CCE agents. This
limit assumes that the BHCA call load and all configured devices are spread equally among the eight
call processing servers with 1:1 redundancy. (See
primary and four backup subscriber servers) can support up to about 4,000 Unified CCE agents. This
limit assumes that the BHCA call load and all configured devices are spread equally among the eight
call processing servers with 1:1 redundancy. (See
, for
redundancy schemes.) Each of the eight Unified CM servers (MCS-7845-H2/I2 or later High
Performance Servers) would support a maximum of 500 agents. In a failover scenario, the primary
Performance Servers) would support a maximum of 500 agents. In a failover scenario, the primary