/XRL/2

R2

REDB$EVA

 

 

 

 

621

621

R1

REDB$EVA

 

 

 

 

621

621, 621

 

 

 

 

 

 

 

Figures

 

 

 

 

id

File

Page

References

VAE

2043CH01

 

 

 

 

6

1

 

 

 

6

VAE4

2043CH01

 

 

 

 

7

2

 

 

 

7

ESA

2043CH01

 

 

 

 

8

3

 

 

 

8

OS3

2043CH01

 

 

 

 

9

4

 

 

 

9

MGTEAM

2043CH03

 

 

 

 

45

5

 

 

 

45

JMPVMC

2043CH03

 

 

 

 

49

6

 

 

 

49

F011

2043CH05

 

 

 

 

107

7

 

 

 

105, 106

WSC9741

2043CH05

 

 

 

 

113

8

 

 

 

117

F042

2043CH05

 

 

 

 

116

9

F054

2043CH06

 

 

 

 

136

11

 

 

 

136

CICSDMS

2043CH06

 

 

 

 

139

12

 

 

 

138

CICSLSC

2043CH06

 

 

 

 

146

13

 

 

 

145

CICSDS

2043CH06

 

 

 

 

146

14

 

 

 

146

F066

2043CH08

 

 

 

 

177

16

F2043A1

2043CH09

 

 

 

 

187

17

 

 

 

186, 186

DOSOPT

2043CH12

 

 

 

 

261

19

 

 

 

260

VS2OPT

2043CH12

 

 

 

 

262

20

 

 

 

261

VS2NAV

2043CH12

 

 

 

 

263

21

 

 

 

262

RESWDD

2043CH12

 

 

 

 

264

22

 

 

 

263

RESWDU

2043CH12

 

 

 

 

264

23

 

 

 

264

RESWDC

2043CH12

 

 

 

 

264

24

 

 

 

264

RESWD2

2043CH12

 

 

 

 

265

25

 

 

 

265

NOOO

2043CH12

 

 

 

 

265

26

 

 

 

262

F107

2043CH13

 

 

 

 

270

27

 

 

 

269

F108

2043CH13

 

 

 

 

271

28

 

 

 

269

F109

2043CH13

 

 

Page 648
Image 648
IBM OS/390 manual XRL/2

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.