service testing & virtualization in an enterprise environments

3370, Service Testing & Virtualization in an Enterprise Environments John Chewter: IBM STSM, Chief Architect Mark Garcia: Senior Certified Executive IT Architect

Please Note:

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• IBM’s statements regarding its plans, directions, and intent are subject to change or withdrawal without notice at IBM’s sole discretion. • Information regarding potential future products is intended to outline our general product direction and it should not be relied on in

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Outline

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• Test Challenges in Enterprise Environment

• Overview of Product’s Mainframe Support

– IMS Connect

– CICS

– MQ/z

– DB2/z (Batch and CICS)

– JCL Batch Automation

• Typical Scenario Analysis

• Benefits & Vista

• Questions

Test Challenges in Enterprise Environment

Multi-tier applications introduce additional complexity

Middle Tier Server Client Tier Devices Back-end Data & Services

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CICS IMS

Only one tenth of an iceberg is visible

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Presentation layer

Integrations, data and

business logic

Traditional UI testing:

Automated Integration Testing and Service

Virtualization:

The majority of risk in modern systems is seldom tested as it is unseen.

• Testing beneath

the UI

• Validate side

effects

Integration Testing

What does an enterprise environment mean to you?

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• An enterprise environment usually: – Has both open and mainframe environments

involved and inter-connected together

– Distributed and inter-connected through

multiple protocols

• HTTP/JSON at front-end

• HTTP/SOAP, JMS at backend open platform

• ECI, IPIC, native link at backend mainframe

platform

– Have multiple middleware installed even

from multiple vendors

• IBM WAS, MQ, IMS, CICS, DB2

• Oracle Fusion, Database

• …

What challenges you encounter with development and

testing within such an environment?

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• As a developer, I don’t like to:

– Fight with testing teams for mainframe/database

resources which are limited and usually have to be

shared

– Be asked by testing teams to produce the mighty test

data which will reproduce the defects found in testing

environment

– …

• As a Tester, I don’t like to:

– Share the same MIPS and DASD with development

team which are told have high charge back rates

– Be limited to very short testing time frames of

mainframe middleware which are part of regular

production environment

– …

Overview of Product’s Mainframe Support

Mainframe Scenarios

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TEST

VIRTUALIZE

VIRTUALIZE

CICS – Transaction Gateway Test and Virtualization

WAS (Adaptor)

Custom code (C)

Custom code (Java)

• Reduced MIP Charges

• Reduced DASD Charges

• Decoupling from mainframe during development and test

• Reduction in scheduling constraints

• Shortening the ratio between defect identification and resolution.

Motivation

CICS – Transaction Server DPL Virtualization

Program B Program A DPL

• Provisioning virtual, simulated CICS regions at a fraction of the cost


• Ability to model and change linked programs (COMMAREA) on the fly


Motivation

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z/OS

CICS

Region J

Program

A

CICS

Region I

Program

B

IBM

RIT Agent

PROD 1 LPAR

CICS

Region A

Program

C

CICS

Region B

Program

D

PROD 2 LPAR

CICS

Region C

Program

E

CICS

Region D

Program

F

PROD 3 LPAR

(DEV)

RTCP

RIT

IBM

CICS Exit

IBM

CICS Exit

IBM

CICS Exit

IBM

CICS Exit

IBM

CICS Exit

IBM

CICS Exit

IBM

RIT Agent

IBM

RIT Agent

12 3 Program

F1

CICS Virtualization Distributed Program Link(DPL)

CICS – DPL Virtualization Scenarios

IMS – IMS Connect - Testing and Virtualization

WAS (TRMA)

Custom code (C/Java) IMS Connect

Proxy

• Reduced MIP Charges

• Reduced DASD Charges

• Decoupling from mainframe during development and test



Motivation

COBOL - CICS – DB2 - Testing and Virtualization

COBOL- CICS

• Provide COBOL Developers with their own test data (DB2)

• Ability to test their programs more thoroughly (negative test cases)



Motivation

COBOL - DB2 - Batch Testing and Virtualization

COBOL Batch

• Provide COBOL Developers with their own test data (DB2)




Motivation

PL1 - DB2 - Batch Testing and Virtualization

PL1 Batch

• Provide PL1 Developers with their own test data (DB2)




Motivation

• Emulate the server application

• No changes to the client or server applications

• Distributed or Host

• Single or multiple queues

• No need to disable the server application

WebSphere MQ – Testing and Virtualization

Client Application

Typical Scenario Analysis

Customer Case I Architecture

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Customer Case I Analysis

• Pain Point:

– Both the distributed MQ and backend mainframe are out of the test

cycle with its integration point, resources are limited.

• Solution:

– Build MQ virtual services that can be leveraged by front-end

applications.

– Leverage MQ/z virtualization capability to make a stub for MQ on

mainframe to serve distributed MQ requests

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Customer Case II Architecture

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Mainframe

WebSphere Application

Server

WebSphere CICS

Transaction Gateway

CICS

Region 1

Region 2

DB2/z Cobol Batch

Programs

Customer Case II Analysis

• Pain Point:

– Insufficient number of CICS regions to thoroughly test their programs on the

mainframe

– Testing cycles were consistently delayed due to bottlenecks caused by multiple testing

and development teams vying for the same CICS region

– Costs to testing mainframe applications were spiraling out of control.

– Lack of test automation to CICS/CTG and JCL/Batch.

• Solution:

– Leverage CICS CTG virtualization capability to make automation test script and build

up stubs to virtualize dependency to CICS region

– Leverage DB2/z virtualization capability to virtualize dependency to real DB2 database

on Z.

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Customer Case III Architecture

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Logical Architecture

JES Sysout

Reports

zOS

DB2/z Cobol Batch

Programs

JES Sysout

Reports

Linux RD&T

DB2/z Cobol Batch

Programs COBOL Migration

Rational Integration Tester (JCL Batch Execution)

JES Sysout

Reports (Deltas)

Customer Case III Analysis

• Pain Point:

– Customer migrated many COBOL/PL1 systems from the mainframe to RD&T (Linux).

– Issues verifying the migration process (previously, all verification was done by running

batch jobs manually on both systems)

– Costs were skyrocketing from manually testing migration process.

– Testing schedules were being prolonged

• Solution:

– Leverage Rational Integration Tester to execute JCL batch jobs on both zOS and

RD&T (Linux)

– Compare outputs from both systems and highlight differences if they exist.

– Use existing process to automate JCL Batch testing

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Benefits & Vista

What benefits you gain when you apply these concepts

• What benefits we gained from automation test & virtualization in an enterprise

environments:

– First of all, virtualization of mainframe always dramatically decreases the

cost for extra MIPS and DASD serving for ever growing development and

testing efforts.

– Secondly, the development and test cycles are decoupled between open

front end and mainframe backend by applying virtualization to both sides.

– Thirdly, more business aligned test resources (e.g., test data) are recorded

and automatically applied to virtualization test to achieve better test case

requirement.

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Questions?

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