IBM Enterprise Workload Manager Release 1

92 IBM Enterprise Workload Manager

For the mortgage rate application, consider the end-to-end response time and the time the

transactions normally spend in the database query. Since the web application server is not

instrumented, the performance objectives defined in the domain policy represent only the

portion of time the transactions spend in DB2 UDB. The application is not quite real-time. The

the portion of the time spent in DB2 for the query is estimated to be about 20 seconds, so the

response time objective is set for 1 minute.

For the mortgage rate application, EWLM can manage and monitor the uninstrumented web

application server regions. A service class is defined for the non-instrumented Web

application server region with a velocity goal. The administrator defines a general service

class name. Velocity is specified as a category Fastest, Fast, Moderate, Slow, or Slowest.

The administrator would also like to manage the processes running the web browsers in the

banks. The browsers, Internet Explorer and Netscape Navigator are processes, and are also

assigned a velocity goal.

For work not otherwise categorized, EWLM provides a service class in every domain policy

called EWLM Service Class. It is assigned a discretionary goal, which specifies that work is to

be completed when resources are available. You can assign a discretionary goal type to a

service class representing low priority work that does not require a particular performance

goal. EWLM processes discretionary work using resources not required to meet the goals of

other service classes.

Based on the service classes, the following workloads are defined for reporting purposes:

򐂰 WAS Applications: WebSphere Application Server EJB application that processes the

bank statements

򐂰 DB2 Applications: The mortgage advisor transactions originating from the non-ARM

instrumented application running in DB2 UDB

򐂰 Non-Instrumented Applications: The Web application server process and the Web

browser processes

򐂰 Web Site Applications: The funds transfer, account query, mortgage rate advisor, and

brokerage buyer transactions, and the static Web serving work.

򐂰 EWLM provides a workload, EWLM Workload, which is assigned to the EWLM Service

Class.

4.2.3 Building a domain policy

Once you have a clear idea of how to classify your workload and how to assign performance

goals to each type, you are ready to build the domain policy. We describe the fundamentals in

this section but provide you with an example of our own policy building in “The ITSO EWLM

scenario” on page 119. This includes the planning, assessing and designing phase. We

Brokerage Buyers Highest 80% complete in 1 seconds

Stock Quotes Medium 80% complete in 10 seconds

Static Web Serving Low 80% complete in 20 seconds

Mortgage Rate Medium 1 minute avg response time

Non instrumented Web Appl High Fast Velocity

Web Browsers Medium Moderate Velocity

Service class Importance Performance goal