Rosalind Radcliffe presented on shifting mainframe software development left to enable continuous integration. She discussed how mainframe applications today rely on outdated development and testing practices. Radcliffe proposed automating deployment of test environments, refactoring applications into services, implementing interface testing using virtual services, integrating production monitoring into development, and using operations data to optimize applications. Case studies showed how financial institutions reduced testing time from weeks to hours and increased test coverage using these practices. Radcliffe's key takeaways were that mainframe development needs modernization, automated testing capacity is critical, and interface testing and virtual services are good starting points.

1. 1IBM
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Chapter
Opening
September 16, 2015Presentation Title
Shift left to
drive
continuous
integration in
mainframe
software
development

2. 2IBM
@RosalindRad
Rosalind Radcliffe
• IBM Distinguished Engineer
• Chief Architect for DevOps for z Systems
• 28 years in IBM
• Started in ISPF Development
• Worked in Services, responsible for SOA management,
modern development tooling for z/OS, and now DevOps
September 16, 2015Shift left to drive continuous integration in mainframe software development

3. 3IBM
_
@RosalindRad
The
worlds
leading
businesses run on
z Systems
92 of the top 100 worldwide banks
23 of the top 25 US retailers
9 out of 10 of the world’s largest insurers
71% of global Fortune 500 companies
Shift left to drive continuous integration in mainframe software development September 16, 2015

4. 4IBM
_
@RosalindRad
~70%of all enterprise transactions
touch a System z55%of all enterprise applications need the
mainframe to complete transactions
91%of surveyed CIOs said that new customer-
facing applications are accessing the mainframe
The mainframe is here to stay with unmatched ability to
support secure growth in data and transactions.
Mainframes process roughly 30 billion
business transactions per day, including most
major credit card transactions and stock trades,
and money transfers.
It is estimated that 80% of the world’s corporate
data resides or originates on mainframes.
IDC France, #mainframe
spending represents 3% of the
spending but 65% of the
mission critical applications
Shift left to drive continuous integration in mainframe software development September 16, 2015

5. 5IBM
@RosalindRad
Mainframe Today
z13 – built for todays mobile
workload
• Reliability, Availability and
serviceability
• Security
• Scalability
• 100 cyber Mondays each
day
• Up to 10 TB of memory
September 16, 2015Shift left to drive continuous integration in mainframe software development

6. 6IBM
@RosalindRad
System Reliability
September 16, 2015Shift left to drive continuous integration in mainframe software development
Mainframe
Distributed
Less
Reliable
More
Reliable
Horizontal
Scaling
Vertical
Scaling

7. 7IBM
@RosalindRad
Mainframe Testing problems today
• Same process and tools for the last 30 years – it just
works why change it
• No standard continuous integration procedures
• Focus on separation of changes not early integration
• Too costly to do automated testing
• Shared environments
September 16, 2015
Region
Shared Data
Region
Region
App 1
App 2
App 3
App 4
App 5
Shift left to drive continuous integration in mainframe software development

8. 8IBM
_
@RosalindRad
Solutions
Automated
Deployment for
additional test
environments
Application
refactoring for
Services (APIs)
Process change
for sift left testing
Integrated
monitoring
Interface testing
Operations data
used for
optimization
September 16, 2015Shift left to drive continuous integration in mainframe software development

9. 9IBM
@RosalindRad
Automated Deployment for Environments
• No MIPS charges
• Create golden image
• Dynamically deploy z/OS image
• Automated deploy of application
updates and data
• Used for development and
automated test runs
September 16, 2015Shift left to drive continuous integration in mainframe software development
IMS DB2
CICS
WAS MQ
z/OS
COBOL, PL/I, C++, Java,
EGL, Batch, Assembler,
X86 PC or HX5 Blade
running Linux
RD&T
RTC RDz RIT

10. 10IBM
@RosalindRad
Process change for shift left testing
• Developers need to be responsible for building unit tests
• Run with code coverage to begin to understand what’s tested
• Use virtual services to isolate to function changed
• Don’t just do happy path testing, include negative testing
• Also include code rules, and other code scanning on check-in
• Automate testing as part of build
September 16, 2015Shift left to drive continuous integration in mainframe software development
Build Deploy Test Provision

11. 11IBM
@RosalindRad
Interface Testing
• Build interface tests to increase automated test coverage
• SoE interface is first place to add testing, and define virtual
service to allow independent development
• Use virtual services to isolate to function changed
September 16, 2015Shift left to drive continuous integration in mainframe software development
Phase 1 Phase 2 Phase 3
App
Test
Case
Virtual
Services
3rd
Part
y
Call
IMS
Data
Acc
ess CICS
Comma
rea Call
App
Test
Case
Virtual
Services
3rd
Party
Call
IMS
Data
Acce
ss CICS
Commar
ea Call
App
Test
Case
Virtual
Servic
es
3rd
Party
Call
IMS
Data
Acce
ss CICS
Commar
ea Call

12. 12IBM
@RosalindRad
Application refactoring for Services
• Use automated testing to insure same results prior to
refactoring
• Begin to break up monolithic programs
• Create callable services
September 16, 2015Shift left to drive continuous integration in mainframe software development
API
API
API
Reuses
Shares
API
Combines
Shares
Composes
API
Enhances
External APIs
API
Consumes
API
API

13. 13IBM
@RosalindRad
Integrated Monitoring
• Use the production monitoring data to understand end
to end application performance
• Examine the individual parts of the application to
determine areas for improvement
• Use the same monitoring tools as in production to
configure monitoring thresholds while in development
September 16, 2015Shift left to drive continuous integration in mainframe software development

14. 14IBM
@RosalindRad
Operations data used for optimization
• Understand the most used or most CPU consuming
modules
• Build automated tests to test these modules and update
with the latest compiler technology, if required
• Understand the most common issues with
deployments, partner to reduce manual intervention,
and improve process
September 16, 2015Shift left to drive continuous integration in mainframe software development

15. 15IBM
_
@RosalindRad
Financial Services Provider
Testing reduced from weeks to hours
Gained visibility, transparency, and
improved planning
Used a common set of modern tools to improve overall
development process. Adopted virtual services and
automated testing as part of the process.
Bank
Automated Testing reduced software
development time by over 90% and
decreased time to market by 40%
Established automated virtual automated test environments
to support the development and test teams, as well as move
to automated testing.
Financial Services Company
Automated deployment of resources to
provide testing environments, can now
deploy z/OS for a team in less than 40
minutes.
Internal z/OS Development Teams
“With the modern tools JAT & Jenkins framework our BVT
can run in half the time it used to take. This allows 50
additional regression test cases to be run with every build in
less total time than the old tools required for just the BVT.”
“Used to be very long to setup a system (VM). Can now
setup 10 systems < 1/2 day” and “Easy to start a new
system if my current instance hosed up”
.
Success Stories
Shift left to drive continuous integration in mainframe software development September 16, 2015

16. 16IBM
_
@RosalindRad
Mainframe
Testing – Key
Takeaways
1.Mainframe development must modernize, the practices
and tools created 30 years ago are no longer
appropriate. Automated testing for mainframe environments
is a change that must be supported via tools and time.
2.Having the capacity needed for automated testing is
critical. Development and test capacity for mainframes to
support automated testing is required. To avoid the MIPS
charges on existing hardware Rational Development and
Test Environments for System z can be used.
3.The use of interface testing and virtual services can be a
good way to get started. Mainframe applications are usually
called via an external interface, use this to build automated
interface testing to build up test cases for existing capability.
Shift left to drive continuous integration in mainframe software development September 16, 2015

17. 17IBM
@RosalindRad
What I need help with
• What are the metrics needed to show automated
testing is providing the coverage to stop all the manual
testing for regression?
September 16, 2015Shift left to drive continuous integration in mainframe software development

18. 18IBM
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Author, Secondary Information
September 16, 2015Presentation Title September 16, 2015IBM
Thank You!
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