Table 1 (Page 3 of

3). Comparison of VSE Functions & Components to OS/390

Replacements

 

 

 

 

 

 

 

VSE

 

OS/390

Comment and Reference

 

 

 

 

ADSM/VSE

 

A D S M / M V S

 

 

 

 

 

DITTO/ESA for VSE

 

DITTO/ESA for OS/390

See Chapter 20 page 381

 

 

 

 

DFSORT/VSE

 

DFSORT *

See Chapter 19 page 375

 

 

 

 

Data Base Management

 

Data Base Management

See Chapter 8 page 169

DL/I

 

IMS/DB

 

DB2 (SQL/DS)

 

DB2

 

QMF

 

QMF

 

 

 

 

 

GDDM/VSE

 

GDDM/MVS *

See Chapter 7 page 155

 

 

 

 

Dump Analysis

 

Dump Analysis

 

Info/Analysis

 

IPCS *

 

(VP)

 

 

 

 

 

 

 

Job Scheduler (VP)

 

OPC/ESA

 

 

 

 

 

Report Manager (VP)

 

RMDS

 

 

 

 

 

NetView family

 

NetView family

 

FTP

 

FTP

 

 

 

 

 

Key: (*) = Package is an element of OS/390. (ISV) = VSE function provided by independent

Software Vendor

2.2 OS/390 Components/Products/Subsystems

Note: The terms OS/390 and MVS (including MVS/XA, MVS/SP, and MVS/ESA) may be used interchangeably throughout this publication. OS/390, with its integrated components, refers to the current version and all previous versions of MVS unless otherwise noted.

Another important aspect to consider when sizing the migration is determining which OS/390 components will be installed. This is basically determined by assessing which OS/390 components and/or optional products provide functions comparable to those in VSE. The previous table in this section provided a comparison chart for this purpose. What follows is a brief description of some of the key OS/390 components.

There was discussion about including that which is the same between the operating systems. This can be a big item when customers are also entertaining ideas of other operating systems. There is more closeness between VSE and OS/390 than with RISC6000/UNIX to OS/390. The move to UNIX will require a new start or complete rewrite.

This is a frequent consideration when customers are considering implementing ERP Applications. They can put these core business integrated packages (for example SAP R3, Bond, JDEdwards, Oracle) on either a UNIX or OS/390 platform.

18VSE to OS/390 Migration Workbook

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IBM manual OS/390 Components/Products/Subsystems, Comparison of VSE Functions & Components to OS/390
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OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.
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