Note: This section provides information relating to the use of workstations
for scheduling jobs and job streams. If, instead, you want to learn
about workstations because you are planning your network, you can
find the information you need in the Tivoli Workload Scheduler Planning
and Installation Guide.
The computer system where you run your jobs and job streams is called a workstation. When you define a job or job stream in the Tivoli® Workload Scheduler database you identify the workstation definitions for the physical or virtual computer systems on which your job is scheduled to run. Workstations can be grouped logically into workstation classes and organized hierarchically into domains, managed by domain managers.
For more information about workstation classes, see Workstation class, and for domains, see Domain.
When you create a workstation definition for a system in your network you define a set of characteristics that uniquely identify the system and affect the way jobs run on it. For example, the IP address of the workstation, whether it is behind a firewall, whether communications with it is secure, what time zone it is in, and the identity of its domain manager.
Workstations in the Tivoli Workload Scheduler scheduling
network cannot only perform job and job stream processing, but can
also have other roles. When your network was designed, these roles
were assigned to these workstations to suit the specific needs of
your business. The full list of workstation roles is as follows:
- Master domain manager
- A workstation acting as the management hub for the network. It manages all your scheduling objects. The master domain manager workstation must be installed as such. This workstation is recorded in the Tivoli Workload Scheduler database as master.
- Backup master domain manager
- A workstation which can act as a backup for the master domain manager, when problems occur. It is effectively a master domain manager, waiting to be activated. Its use is optional. Learn more about switching to a backup master domain manager in the Tivoli Workload Scheduler Administration Guide. The master domain manager workstation must be installed as such. This workstation is recorded in the Tivoli Workload Scheduler database as fta.
- Domain manager
- A workstation that controls a domain, and shares management responsibilities for part of the Tivoli Workload Scheduler network. It is installed as an agent, and then configured as a domain manager workstation when you define the workstation in the database. This workstation is recorded in the Tivoli Workload Scheduler database as manager.
Dynamic domain manager
- An installed component in a distributed Tivoli Workload Scheduler network
that is the management hub in a domain. All communication to and from
the dynamic agents in
the domain is routed through the dynamic domain manager.
When you install a dynamic domain manager the
workstation types listed below are created in the database:
- fta
- Fault-tolerant agent component manually configured as domain manager
- broker
- Broker server component
- agent
- Dynamic agent component
- Backup dynamic domain manager
- A workstation which can act as a backup for the dynamic domain manager,
when problems occur. It is effectively a dynamic domain manager,
waiting to be activated. Its use is optional. Learn more about switching
to a backup dynamic domain manager in
the Tivoli Workload Scheduler Administration
Guide.
When you install a dynamic domain manager the
workstation types listed below are created in the database:
- fta
- Fault-tolerant agent component.
- broker
- Broker server component
- agent
- Dynamic agent component
- Fault-tolerant agent
- A workstation that receives and runs jobs. If there are communication problems with its domain manager, it can run jobs locally. It is installed as an agent, and then configured as a fault-tolerant agent workstation when you define the workstation in the database. This workstation is recorded in the Tivoli Workload Scheduler database as fta.
- Standard agent
- A workstation that receives and runs jobs only under the control of its domain manager. It is installed as an agent, and then configured as a standard agent workstation when you define the workstation in the database. This workstation is recorded in the Tivoli Workload Scheduler database as s-agent.
- Extended agent
- A workstation where a Tivoli Workload Scheduler for Applications access method has been installed as a bridge so that you can schedule jobs in the SAP R/3, Oracle E-Business Suite, PeopleSoft, z/OS, or custom applications. It must be physically hosted by a master domain manager, domain manager, standard agent, or a fault-tolerant agent (up to 255 extended agents per fault-tolerant agent) and then defined as an extended agent in the database. For more information, see Managing extended agents and the Tivoli Workload Scheduler for Applications User's Guide. This workstation is recorded in the Tivoli Workload Scheduler database as x-agent.
- Workload broker
- A workstation that runs both existing job types and job types with advanced options.
It is the broker server installed with the master domain manager and
the dynamic domain manager.
It can host one or more of the following workstations:
- extended agent
- remote engine
- pool
- dynamic pool
- agent. This definition includes the following agents:
- dynamic agent
- Tivoli Workload Scheduler for z/OS agent
- agent for z/OS
For more information about the dynamic agent and Tivoli Workload Scheduler for z/OS agent, see Scheduling Workload Dynamically. For more information about the agent for z/OS, see Scheduling with the agent for z/OS.
- Dynamic agent
- A workstation
that manages a wide variety of job types, for example, specific database
or FTP jobs, in addition to existing job types. This workstation is
automatically created and registered in the Tivoli Workload Scheduler database
when you install the dynamic agent.
The dynamic agent is
hosted by the workload broker workstation.
Because the installation and registration processes are performed
automatically, when you view the dynamic agent in
the Dynamic Workload Console,
it results as updated by the Resource Advisor Agent. You can group dynamic agents in
pools and dynamic pools. This workstation is recorded in the Tivoli Workload Scheduler database
as agent.
- Pool
- A
logical workstation that groups a set of dynamic agents with
similar hardware or software characteristics to submit jobs to. Tivoli Workload Scheduler balances
the jobs among the dynamic agents within
the pool and automatically reassigns jobs to available dynamic agents if
a dynamic agent is
no longer available. To create a pool of dynamic agents in
your Tivoli Workload Scheduler environment,
define a workstation of type pool hosted by the workload broker workstation,
then select the dynamic agents you
want to add to the pool. You can define the pool using the Dynamic Workload Console or
the composer command. This workstation is recorded in the Tivoli Workload Scheduler database
as pool.
- Dynamic pool
- A
logical workstation that groups a set of dynamic agents,which
is dynamically defined based on the resource requirements you specify
and hosted by the workload broker workstation.
For example, if you require a workstation with low CPU usage and Windows
installed to run your job, you specify these requirements using the Dynamic Workload Console or
the composer command. When you save the set of requirements,
a new workstation is automatically created in the Tivoli Workload Scheduler database.
This workstation maps all the dynamic agents in
your environment that meet the requirements you specified. The resulting
pool is dynamically updated whenever a new suitable dynamic agent becomes
available. Jobs scheduled on this workstation automatically inherit
the requirements defined for the workstation. This workstation is hosted by the workload broker workstationand
recorded in the Tivoli Workload Scheduler database
as d-pool.
- Remote engine
- A workstation
that manages the exchange of information about cross dependencies
resolution between your environment and a remote Tivoli Workload Scheduler
for z/OS engine (controller) or a Tivoli Workload Scheduler engine
(master domain manager or backup master domain manager). This workstation is hosted by the workload broker workstation and
recorded in the Tivoli Workload Scheduler database
as rem-eng.
Note: If you plan
to change the workstation types, consider the following rules:
- you can change fault-tolerant agent, standard agent, extended agent, domain manager and dynamic workload broker workstations to any workstation type, with the exception of dynamic agent, pool, dynamic pool, and remote engine.
- you cannot change the type of dynamic agent, pool, dynamic pool, and remote engine.
For information about how to define workstations, see Workstation definition.