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260 Problem Determination Using Self-Managing Autonomic Technology

8.1 Scenario description

This scenario provides a solution when an application reaches a threshold limit of

disk utilization. A custom resource model will be monitoring free disk space on

the file system. If the free space is below a certain limit, the first corrective action

is to ZIP all old files into a backup archive. If the free space continues to drop

below a second limit, the second corrective action is to delete old backup

archives.

The scenario uses custom Common Information Model (CIM) Instrumentation

Library Type (ILT) classes as data sources and for performing corrective actions.

The configuration of the resource model is performed with both parameters and

thresholds.

Figure 8-1 shows an outline of all components of the scenario. The following

sections provide details of this example scenario implementation.

Figure 8-1 Components of scenario one

8.2 Resource model definition

This section defines a resource model for this scenario using the Tivoli Resource

Model Builder. Refer to 6.2, “Resource models” on page 199, which outlines the

different components of resource models.

File system

Application Node

Data

Scenario1 Application

Insert Data

AME Runtime

(SARA)

AME

RM

Action

Free up disk space

Monitor disk usage

Use Diskspace

Chapter 8. Problem Determination scenario one 261

8.2.1 Creating the Eclipse project

To create a Tivoli resource model project in the Resource Model Builder, perform

the following steps:

1. To start the Eclipse, select Start → Programs → IBM Autonomic

Computing Toolkit → Development kit → Start Eclipse.

2. Open the Tivoli Management Perspective by selecting Window → Open

Perspective → Other → Tivoli Management Perspective.

3. Create a new Tivoli Management Project by selecting File → New → Project

and then selecting Tivoli Management Project, as shown in Figure 8-2.

Figure 8-2 New Tivoli Management Project

4. Click Next.

5. Enter your Project name, for example ACPD_Scenario_One, and click Next.

6. Now, it is not possible to start the Basic Resource Model Wizard or the Empty

Resource Model Wizard. To create an empty project, just click Finish.

262 Problem Determination Using Self-Managing Autonomic Technology

8.2.2 General resource model settings

Now that the project is in place, resource models can be created. To create an

empty resource model, perform the following steps:

1. Right-click the project MyManagementProject and select New → Empty

Resource Model Wizard. The Empty Resource Model Wizard window

opens, as shown in Figure 8-3.

Figure 8-3 Tivoli Empty Resource Model Wizard

2. Click Next after filling all the fields with the following information:

Internal Name ACPD_Scenario_One

Descriptive Name ACPD_Scenario_One_Disk_Storage

Description Monitors the free disk space in a

specific folder. If the amount of free

disk gets too low, then all files older

than one day are zipped (except zip

files). If there is still not enough

diskspace, then all zip files older than

one week are deleted.

Category Internal Name storage

Chapter 8. Problem Determination scenario one 263

Category Descriptive Name Disk storage

Major Version 1

Minor Version 0

Cycle Time 60

Script Language Selection Set the script type of the decision algorithm to

JavaScript, which enables the resource

model to be used on all platforms.

Select the platforms w32-ix86

3. Now, select the project name to contain the resource model, as shown in

Figure 8-4. Specify the File name of the resource model and click Finish. By

default, the wizard suggests the internal name followed by .jrm.

Figure 8-4 Select project for resource model and specify its name.

Now, the workspace should look like the one shown in Figure 8-5 on page 264.