/XRL/25

 

86

7

OSJCL

2043CH04

 

 

88

8

POWJECL

2043CH04

 

 

89

9

J2JECL

2043CH04

 

 

90

10

 

 

89

JESIN

2043CH10

 

 

212

11

JSCHED

2043CH10

 

 

213

12

OUTSERV

2043CH10

 

 

215

13

FCB

2043CH10

 

 

217

14

TSOFUNC

2043CH10

 

 

219

15

TABC161

2043CH10

 

 

224

16

PMACS

2043CH10

 

 

226

17

 

 

211

PLINE

2043CH10

 

 

228

18

 

 

219, 221

PRMTB

2043CH10

 

 

228

19

 

 

220

PRMTS

2043CH10

 

 

229

20

 

 

220

PNODE

2043CH10

 

 

230

21

 

 

221

PCPTAB

2043CH10

 

 

230

22

PEXIT

2043CH10

 

 

231

23

 

 

220, 221

NJENM

2043CH10

 

 

233

27

NJEFCC

2043CH10

 

 

234

28

NJECM

2043CH10

 

 

234

29

PRNTDEV

2043CH11

 

 

239

30

PSFOPER

2043CH11

 

 

242

31

BUPE

2043CH12

 

 

252

32

 

 

249, 251

TERMST

2043CH12

 

 

257

33

 

 

257

DOSOPT1

2043CH12

 

 

261

34

VS2OPT1

2043CH12

 

 

262

34

VS2NAV1

2043CH12

 

 

263

34

PLICHRT

2043CH17

 

 

351

34

 

 

249

LBUPE

2043CH17

 

 

353

35

 

 

351, 353

CPLIOPT

2043CH17

 

 

355

36

 

 

354

CMIG

2043CH17

 

 

355

37

 

 

355

B M I G

2043CH17

 

 

356

38

 

 

356

DMIG

2043CH17

 

 

356

39

 

 

356

PMIG

2043CH17

 

 

357

40

 

 

356

ILCMIG

2043CH17

 

 

358

41

Page 671
Image 671
IBM OS/390 manual XRL/25

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.