VSE (continued)

 

 

 

 

year2000 (continued)

 

virtual storage macros

289

transition definition

582

VSAM backup/restore

387

 

your hardcopy library

412

VTAM

188

 

 

 

 

 

your softcopy library

412

VSE & MVS JCL comparison

91

YY format definition 582

sample MVS JCL

93

 

 

YYYY format definition

582

sample VSE JCL

92

 

 

 

 

sample VSE plus carry-over

94

 

VSE/ESA conversion facilities

520

 

VSE/ESA environment 370

 

 

 

VSE/ESAs JCL philosophy

70

 

 

VSE/Fast Copy

397

 

 

 

 

 

VSE/Fast Copy online

397

 

 

 

VSE/ICCF to MVS

163

 

 

 

 

VSE/ICCF to TSO/E 163

 

 

 

 

VSE/ICCF vs.TSO/ISPF

 

 

 

 

creating & executing ISPF applications 440

 

editing data sets

438

 

 

 

 

managing projects

440

 

 

 

retrieving output

441

 

 

 

 

submitting jobs

439

 

 

 

 

tracking jobs

441

 

 

 

 

 

using ISPF utilities

439

 

 

 

using SDSF for operators

441

 

VSE/VSAM access from OS/390

118

 

VTAM data sets

186

 

 

 

 

VTAM tables

190

 

 

 

 

 

VTAM tuning

190

 

 

 

 

 

VTAMLST

190

 

 

 

 

 

 

VTOC Considerations

109

 

 

 

 

VTOC processing

108

 

 

 

 

W

Wait handling 288

WAIT/POST macros 285

WAITF CLOSE macro 314

Web URL 40

who is affected by migration 26 why customers migrate 3 WORKFILE 336

workstation subsystem controller 189 WRITE macro 307, 314

WTO & WTOR macros 278 WTRPROT 339

X

XCF 189

XPI calls 147

XXL KSDS 121

Y

year 2000 181 year2000

challenge definition 582 ready definition 582 support definition 582

620VSE to OS/390 Migration Workbook

Page 644
Image 644
IBM OS/390 manual VSE Year2000, Vtamlst

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.