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Cisco Personal Assistant 1.4 Installation and Administration Guide
OL-4590-03
Chapter 1 Planning for Personal Assistant
Creating Server Clusters
Interactions of the Personal Assistant Server and Speech-Recognition Server
Personal Assistant separates the speech-recognition functions from call routing and other basic
functions of the Personal
Assistant server. Because these functions are separate, you must configure the
interaction between the cluster of Personal
Assistant servers and the cluster of speech-recognition
servers. This section describes how the clusters interact, and what you need to do to enable the
interaction.
Figure 1-2 illustrates the Personal Assistant server structure. The dotted line between Personal Assistant
server B and speech-recognition server 3 illustrates the direct interaction between these servers after the
connection is established through the resource manager on Personal
Assistant server C.
Figure 1-2 Personal Assistant Server Structure
Figure 1-2 assumes that you are installing Personal Assistant servers and speech-recognition servers on
separate platforms. However, you can install the Personal Assistant servers and speech-recognition
servers on the same platform. When installed on the same platform, the servers still establish
communications through a resource manager, even if the resource manager is on the same system. In
fact, you could create a redundant Personal
Assistant speech cluster with two systems, each running a
Personal
Assistant server, license manager, and speech-recognition server. Logically, this minimal
cluster looks the same as the one illustrated in
Figure 1-2.
To enable the interaction between the Personal Assistant servers and speech-recognition servers, you
must identify the license managers to a Personal
Assistant server. See the “Configuring Speech
Recognition” section on page 4-4 for information on how to do this.
Creating Server Clusters
Personal Assistant servers and speech-recognition servers work together in server clusters. This makes
it possible to share the load among servers, and to set up failover relationships so that if a server becomes
disabled, another server can take over with minimal interruption for your users.
To set up the server clusters, you must:
1. Determine your server and speech-recognition requirements and install the Personal Assistant
server and speech-recognition software on an applicable number of servers.
The number of servers required is based on the number of sessions each server supports, the number
of users you are supporting, and how many users you are willing to support per session.
It is also affected by the number of Cisco CallManager clusters you have, and the distribution of
WAN connections between them.
PA server A
PA server B
PA server C
license mgr,
resource mgr
1
2
3
Speech-Recognition
Server Cluster
Personal Assistant
Server Cluster
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