Mainframe Tooling
 

In this second part of this blog series we will detail the mainframe features you can find in Clarive and how they are integrated into the system.

Clarive Mainframe Features

Clarive manages all aspects of the z/OS code lifecycle:

  • Sending files to z/OS partitions
  • Character translation maps and codepages
  • Identify relationships – impact analysis
  • JCL Template Management
  • Submit JCL
  • Nested JCL Management and synchronous – asynchronous queue control
  • Retrieve Job Spool output and parse results

Integration rules

Clarive z/OS features 3 entirely different integration points with the mainframe. Each integration feature serves a specific purpose

  • Job queue access – to ship files and submit jobs into the z/OS job queue in batch mode. Clarive will track all nested jobs and parse results into the job tree.

  • ClaX Agent – for delivering files into Datasets and/or OMVS partitions and executing z/OS processes online. This is the preferred way of running REXX scripts sent from Clarive to the mainframe. Access z/OS facilities such as SDSF®,ISPF®, VSAM® data records or RACF®.

  • Webservices Library – for writing code that initiates calls from the mainframe directly into Clarive using TCP/IP sockets and the RESTful webservices features of the Clarive rules.

Clarive to Mainframe Integration Point

Clarive to Mainframe Integration Point

Tool considerations

Clarive is a tool that allows enterprise companies to implement an end-to-end solution to control the software lifecycle providing countless out-of-the-box functionalities that help solving any complex situation (automation, integration with external tools, critical regions, manual steps through the process, collaboration, etc.)

CCMDB – Configuration Items

In Clarive any entity that is part of the physical infrastructure or the logical lifecycle is represented as a configuration item (CI). Servers, projects/applications, sources repositories, databases, users, lifecycle states, etc. are represented as CIs in Clarive under the name Resource.

Any resource can have multiple relationships with other resources (i.e. an application is installed in one server in production, a user is developer of an application, the Endevor “system x/subsystem y” combination is the source code repository related to an application, etc.)

The graph database made of this entities and relationships is Clarive’s Change oriented Configuration Management Database (CCMDB). The CCMBD is used to keep the whole system configuration as well as to do impact analysis, infrastructure requests management, etc.

CCMDB

Clarive to Mainframe Integration Point

 

Natures / Technologies

Clarive natures are special CIs in Clarive that automate the identification of technologies to be deployed by a deployment job. A nature can be detected by
file path/name (i.e. Nature SQL: *.sql), by project variable values (i.e. ${weblogic}:Y) or by parsing the changed files code (i.e. COBOL/DB2: qr/EXEC SQL/)

Natures list

Natures list

 

JES spool monitoring

Clarive will take care of downloading and parsing the spool output when submitting a JCL in z/OS to split the DDs available in the output and to identify and use the return codes of all steps executed in the JCL.

JES output viewer

JES output viewer

 

Calendaring / Deployment scheduling – Calendar slots

Any deployment job in Clarive will be scheduled and Clarive will provide the available slots depending on the infrastructure affected by the deployment. Infrastructure administrators can define these slots related to any CCMDB level (environment, project, project groups, server, etc…)

Calendar slots definition

Calendar slots definition

 

Rollback

Clarive rule will allow the administrator to define the way to rollback changes. In either Endevor and ChangeMan ZMF it will execute a Backout operation on each package included in the job.

Rollback control

Rollback control

 

Next Steps

Features are an important step when picking the right tool to bring DevOps to the mainframe.

In the next 2 installments of this series we will review how Clarive can deploy mainframe artifacts (or elements), either by driving popular z/OS SCM tool such as CA Endevor or Serena ChangeMan, or replacing them with Clarive’s own z/OS deployment agents.


Read the first post of this series and learn more on how to bring DevOps to the mainframe.


Elixir logo

The DevOps movement in general, tends to exclude any technologies that are outliers to the do-it-yourself spirit of DevOps. This is due to the nature of how certain technologies are closed to developer-driven improvements, or roles are irreversibly inaccessible to outsiders.

That’s not the case in the mainframe. The mainframe is armed with countless development tools and programmable resources that rarely failed to enable Dev to Ops processes.

Then why DevOps practices have not prospered in the mainframe?

  • Ops are already masters of any productive or pre-productive environments – so changing the way developer teams interact with those environments require more politics than technology and are vetted by security practices already in place.
  • New tools don’t target the mainframe – the market and open source communities have focused first on servicing Linux, Windows, mobile and cloud environments.
  • Resistance to change – even if there were new tools and devs could improve processes themselves, management feels that trying out new approaches, especially those that go “outside the box”, could end up putting these environments, and mission-critical releases at risk.

Organizations want to profit from DevOps initiatives that are improving the speed and quality of application delivery in the enterprise at a vertiginous pace. But how can they leverage processes that are already in place with the faster and combined pipelines setup in the open side of the house?

Enter Clarive for z/OS

Our clients have been introducing DevOps practices to the mainframe for many years now. This has been made possible thanks to the well-known benefits of accepting and promoting the bimodal enterprise.

There are two approaches that can be used simultaneously in accomplishing:

  • Orchestrate mainframe tools and processes already in place – driving and being driven by the organization’s delivery pipeline
  • Launch modernization initiatives that change the way Dev and Ops deliver changes in the mainframe

Business Benefits bringing DevOps to the Mainframe

The benefit is simple. Code that runs in the mainframe is expensive and obscure. By unearthing practices and activities, organizations gain valuable insight that can help transform the z/OS-dependent footprint into a more contained and flexible part of the pipeline with these key benefits:

Coordinate and Speed-up Application Delivery

Mainframe systems don’t run in isolation. The data it manages and the logic it implements are shared as a single entity throughout the enterprise by applications in the open, cloud and even mobile part of the organization. Making changes that disrupt different parts of this delicate but business-critical organism needs to be coordinated at many phases, from testing to UATs to production delivery. Delivering change as a single transactional pipeline has to be a coordinated effort both forward and backwards.

End-to-End Visibility

DevOps practices perceive the mainframe as a closed box that does not play well with activities that target better visibility and end-to-end transparency. Having dashboards and reports that can work as input and output from the mainframe release processes into other pipelines will help deliver change.

Run a Leaner Operation and Avoid Waste

Creating mainframe processes that are part of the bigger picture help determine where constraints may lay and what parts of the pipeline may be deemed obsolete or become bottlenecks.

Lower Release Costs

Mainframe tools are expensive and difficult to manage. MIPS and processing in the mainframe may be capped and new processes could create unwanted expenses. Relying more on tools that drive the mainframe from Linux may in return translate into significant per release cost savings, encouraging a more continuous release process.

Use Cases

The following is a list of the most relevant benefits of Clarive z/OS and popular use cases that our clients have implemented using the Clarive z/OS platform and tools:

  • Compile and link programs using JCL preprocessed templates. Deploy DB2 items directly to the database.
  • Compile related COBOL programs when Copybooks change
  • Total control what is deployed to each environment at a given time
  • Schedule jobs according to individualized release and availability calendars and windows
  • Request approval for critical deployment windows or sensitive applications or items
  • Keep the lifecycle in sync with external project and issue management applications
  • Run SQA on the changes promoted. Block deployment if a minimum score has not been reached
  • Reliably rollback changes in Production, replacing previous PDS libraries with the correct ones
  • Provision CICS resources on request by users

Stay tunned for more of these DevOps for mainframe blog series!


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