IBM Tivoli Workload Scheduler for z/OS Best Practices: End-to-end and mainframe scheduling, 2nd Edition

312 IBM Tivoli Workload Scheduler for z/OS Best Practices

Each domain manager is responsible for distribution of the plan to the

fault-tolerant agents (FTAs) in its domain. A domain manager also handles

resolution of dependencies between FTAs in its domain.

Fault-tolerant agents, the workhorses of a Tivoli Workload Scheduler network,

are where most jobs are run. As their name implies, fault-tolerant agents are

fault

tolerant

. This means that in the event of a loss of communication with the domain

manager, FTAs are capable of resolving local dependencies and launching their

jobs without interruption. FTAs are capable of this because each FTA has its own

copy of the Symphony plan. The Symphony plan contains a complete set of

scheduling instructions for the production day. Similarly, a domain manager can

resolve dependencies between FTAs in its domain even in the event of a loss of

communication with the master, because the domain manager’s plan receives

updates from all subordinate FTAs and contains the authoritative status of all

jobs in that domain.

The master domain manager is updated with the status of all jobs in the entire

IBM Tivoli Workload Scheduler network. Logging and monitoring of the IBM Tivoli

Workload Scheduler network is performed on the master.

Starting with Tivoli Workload Scheduler V7.0, a new Java™-based graphical user

interface was made available to provide an easy-to-use interface to Tivoli

Workload Scheduler. This new GUI is called the Job Scheduling Console (JSC).

The current version of JSC has been updated with several functions specific to

Tivoli Workload Scheduler. The JSC provides a common interface to both Tivoli

Workload Scheduler and Tivoli Workload Scheduler for z/OS.

13.2 The terminology used in this book

The Tivoli Workload Scheduler V8.2 suite comprises two somewhat different

software programs, each with its own history and terminology. For this reason,

there are sometimes two different and interchangeable names for the same

thing. Other times, a term used in one context can have a different meaning in

another context. To help clear up this confusion, we now introduce some of the

terms and acronyms that will be used throughout the book. In order to make the

terminology used in this book internally consistent, we adopted a system of

terminology that may be a bit different than that used in the product

documentation. So take a moment to read through this list, even if you are

already familiar with the products.

IBM Tivoli Workload Scheduler V8.2 suite

The suite of programs that includes Tivoli Workload

Scheduler and Tivoli Workload Scheduler for z/OS. These

programs are used together to make end-to-end

Chapter 13. Introduction to end-to-end scheduling 313

scheduling work. Sometimes called just Tivoli Workload

Scheduler.

IBM Tivoli Workload Scheduler

The version of Tivoli Workload Scheduler that runs on

UNIX, OS/400, and Windows operating systems, as

distinguished from Tivoli Workload Scheduler for z/OS, a

somewhat different program. Sometimes called IBM Tivoli

Workload Scheduler Distributed. Tivoli Workload

Scheduler is based on the old Maestro program.

IBM Tivoli Workload Scheduler for z/OS

The version of Tivoli Workload Scheduler that runs on

z/OS, as distinguished from Tivoli Workload Scheduler

(by itself, without the

for z/OS specification). Tivoli

Workload Scheduler for z/OS is based on the old OPC

(Operations Planning & Control) program.

Master The top level of the Tivoli Workload Scheduler or Tivoli

Workload Scheduler for z/OS scheduling network. Also

called the master domain manager, because it is the

domain manager of the MASTERDM (top-level) domain.

Domain manager The agent responsible for handling dependency

resolution for subordinate agents. Essentially an FTA with

a few extra responsibilities.

Backup domain manager

A fault-tolerant agent or domain manager capable of

assuming the responsibilities of its domain manager for

automatic workload recovery.

Fault-tolerant agent (FTA) An agent that keeps its own local copy of the plan

file and can continue operation even if the connection to

the parent domain manager is lost. In Tivoli Workload

Scheduler for z/OS, FTAs are referred to as

fault-tolerant

workstations

.

Standard agent A workstation that launches jobs only under the direction

of its domain manager.Tivoli Workload Scheduler

Extended agent A logical workstation that enables you to launch and

control jobs on other systems and applications, such as

PeopleSoft, Oracle Applications, SAP, and MVS JES2 and

JES3.

Scheduling engine A Tivoli Workload Scheduler engine or Tivoli Workload

Scheduler for z/OS engine.

IBM Tivoli Workload Scheduler engine

The part of Tivoli Workload Scheduler that does actual