Worker Group Vs Controller

XenApp 6.5 offers new roles, including a worker role (session host only) and a controller role. The default role for a XenApp server is a controller role. The controller server is responsible for farm management tasks while the only task of the session-only servers or workers is to host user sessions.
A farm requires at least one server to act as a controller, which can host the XML and Zone Data Collector roles. A worker cannot perform the role of a data collector, nor can it trigger elections.
There might be times when you need to determine the role of a particular XenApp server in the farm.

Instructions

There are two methods to detect if a XenApp 6.5 server is a worker or a controller.

To detect if a XenApp 6.5 server is a worker or a controller, complete the following procedure:

1. Open the AppCenter Console.
2. Navigate to the Servers section.
3. Click the server you want to check.
4. In the Information tab note the value for the Session-host Mode field. Following are the values for this field:
   
   • Disabled: Indicates that this server is a controller.
   • Enabled: Indicates that this server is a worker.

The  second method to detect if a XenApp 6.5 server is a worker or a controller is to check the server registry in the following location:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\IMA\RUNTIME
For the DWORD named WorkerRole, a value of 0 (zero) indicates that the server is a controller and a value of 1 indicates that the server is a worker.

Switching Between a Worker or a Controller

You can switch between a worker or controller with the XenApp Server Role Manager:
To  switch between a worker or a controller, complete the following procedure:

1. Start the XenApp Server Role Manager.
2. Remove the server from the farm.

3. From the XenApp Server Role Manager click Configure.

4. Click Add this server to an existing server farm to add the farm:

5. Select the appropriate database and shadowing options.
6. On the XenApp Server Configuration, enable the Data Collections Options, as shown in the following screen shot:

7. Note the session host only dialog. Session-host indicates that the server is a worker.