IBM Enterprise Workload Manager Release 1

Chapter 1. IBM Enterprise Workload Manager Overview 5

form the basis for the introduction of goal-oriented autonomic management techniques, like

those from the z/OS platform. So, while you are looking at a potential problem, the

environment is adapting itself to mitigate, or even eradicate the problem.

As was the case with the z/OS Workload Manager, the EWLM product introduces one level of

management in the first release to get you started. Over time EWLM support will expand to

internally automate management of server and application performance. Adaptive heuristic

management is a necessary element of being “on demand”: avoiding problems, repairing

problems, and helping you to raise server utilization to respectable levels.

1.2 EWLM concepts

To get started with EWLM there are some simple concepts that we need to introduce. EWLM

is an implementation of policy-based performance management. The scope of management

is a set of servers that you logically group into what is called an EWLM

management domain.

The set of servers included in the management domain have some type of relationship; for

example, the set of servers supporting a particular line of business. The line of business may

consist of multiple business processes, spread across a few servers or a thousand servers.

Figure 1-3 EWLM architecture

There is a management focal point for each EWLM management domain, called the EWLM

domain manager. As shown in Figure 1-3, there is a one-to-one relationship: one domain

manager instance per management domain. The domain manager coordinates policy actions

across the servers, tracks the state of those servers, and accumulates performance statistics

on behalf of the domain.

On each server (operating system) instance in the management domain there is a thin layer

of EWLM logic installed called the EWLM

managed server. From one perspective the

managed server layer is positioned between applications and the operating system. The

Internet

Websphere

Application

Servers

Internet/

Extranet

Appliance

Servers

Database Server

Apache, IIS, WAS

HTTP servers

Database Server

EWLM Management Domain

Domain manager

Control

Center