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Introduction

This chapter provides a high level description of ChangeMan ZDD.

What is ChangeMan ZDD?

ChangeMan ZDD is a software infrastructure technology that makes mainframe data sets and job output appear in Windows® Explorer and other desktop applications as though they are local files or files on a Windows® network. It simulates a network file system on a Windows® platform that is networked with a z/OS® operating system.

From your PC, you can access files, execute jobs, and examine output from jobs that reside on a z/OS server. No special execution environment or programming interface is required.

ChangeMan ZDD also gives you desktop access to ChangeMan ZMF. ChangeMan ZMF instances, applications, packages, and libraries appear as folders in Windows Explorer and other PC applications. You perform many ChangeMan ZMF functions from your PC, and all of the software configuration management rules and restrictions set up in ChangeMan ZMF apply.

ChangeMan ZDD has two components:

  • ChangeMan ZDD client, which is installed on your desktop workstation.

  • ChangeMan ZDD server, which is installed on an enterprise server to provide access to files and services on an LPAR.

The primary component of ChangeMan ZDD server is Sernet.

What is Sernet?

Sernet (previously called Serena/Network) provides communication and other services on the enterprise server for Micro Focus Serena products. Sernet runs as a started task on an LPAR.

Some products, such as ChangeMan ZMF, run as applications under a Sernet instance. Other products, such as ChangeMan ZDD, run on other platforms and use a Sernet instance to get access to mainframe files and services.

The diagram on the next page is a logical view of the Sernet architecture.

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Serena Software SERNET Architecture

Serena SERNET Architecture with ZDD and ZMF4ECL Interfaces

The diagram shows two Sernet instances on separate LPARs, each managing a ChangeMan ZMF instance. Users access these ChangeMan ZMF instances from the Web, from workstations in the distributed environment, and from TSO sessions in the z/OS environment. The TSO user in the last LPAR is using the Load Balancing Option of ChangeMan ZMF to work from a mainframe environment where there is no Sernet or ChangeMan ZMF instance.

ChangeMan ZDD Server

When you configure a ChangeMan ZDD client on your desktop workstation, you specify one or more ChangeMan ZDD servers.

Each ChangeMan ZDD server is a Sernet started task. Each Sernet started task that acts as a ChangeMan ZDD server must:

  • Connect to the network with TCP/IP.

  • Run with licenses that enable ChangeMan ZDD programs.

  • Run with Sernet keyword option XCH=port to provide connectivity to ChangeMan ZDD clients.

In the ChangeMan ZDD client, you configure each server definition with:

  • An IP address for the LPAR where the ChangeMan ZDD server resides.

  • A port number for connectivity, which is the port number specified in the XCH=port keyword option for the Sernet started task.

Accessing ChangeMan ZMF Servers

From a ChangeMan ZDD client on a desktop workstation, you may access one or more ChangeMan ZMF servers through a ChangeMan ZDD server.

You need only one ChangeMan ZDD server on an LPAR to access all instances of ChangeMan ZMF running on that LPAR.

ChangeMan ZDD Server Design

If you already have a Sernet instance running another product, you can use that started task to act as a ChangeMan ZDD server, or you can install and configure a separate Sernet started task to act as a dedicated ChangeMan ZDD server.

We recommend that you install a separate Sernet started task to act as a dedicated ChangeMan ZDD server.

A separate started task will:

  • Reduce contention for Sernet resources

  • Avoid operational conflicts in areas such as scheduled downtime and disaster recovery priority

Installation tasks in this manual are separated into three chapters. Execute the steps in the chapter or chapters that describes the design that you want to use for your ChangeMan ZDD server:

While we do not recommend the design described in Add ChangeMan ZDD To ChangeMan ZMF, it may be used if you want to use ChangeMan ZDD primarily to access a single ChangeMan ZMF instance. Using an existing Sernet instance is also the quickest way to get ChangeMan ZDD running to explore its capabilities and demonstrate its benefits.

Note

Regardless of which ZDD server design you choose, you must have a ZDD server on each LPAR where a ZMF instance runs that you will access from ZDD clients.

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Dedicated ZDD Server

This diagram shows a Windows workstation using a dedicated ZDD server Sernet A to access mainframe data sets, jobs, and Unix files, and to connect to two ZMF instances, ZMF 2 and ZMF 3.

Dedicated ZDD Server

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Non-dedicated ZDD Server

This diagram shows a Windows workstation using a ZMF server Sernet A as a ZDD server to access mainframe data sets, jobs, and Unix files, and to connect to three ZMF instances, ZMF 1, ZMF 2 and ZMF 3.

Non-dedicated ZDD Server

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ZDD Added to One ZMF Instance

This diagram shows a Windows workstation using a ZMF server Sernet A as a ZDD server to access mainframe data sets, jobs, and Unix files, and to connect to ZMF instance ZMF 1.

This is the configuration that you use to add ZDD to an existing ZMF instance without installing a dedicated ZDD server.

ZDD Added to One ZMF Instance

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