/XRL/3

 

274

29

 

 

273

F1010

2043CH13

 

 

279

30

 

 

278

F1011

2043CH13

 

 

295

31

 

 

294

F1012

2043CH13

 

 

295

32

 

 

294

F1038

2043CH13

 

 

296

33

 

 

294

F1013

2043CH13

 

 

297

34

 

 

296

F1014

2043CH13

 

 

302

35

 

 

301

F1015

2043CH13

 

 

303

36

 

 

301

F1016

2043CH13

 

 

304

37

 

 

303

F1017

2043CH13

 

 

310

38

 

 

309

F1018

2043CH13

 

 

311

39

 

 

309

F1019

2043CH13

 

 

312

40

 

 

311

F1020

2043CH13

 

 

313

41

 

 

312

F1021

2043CH13

 

 

317

42

 

 

316, 324

F1022

2043CH13

 

 

318

43

 

 

317

F1032

2043CH13

 

 

318

44

 

 

318, 325

F1031

2043CH13

 

 

319

45

 

 

318

F1023

2043CH13

 

 

319

46

 

 

318, 319

F1024

2043CH13

 

 

320

47

 

 

318, 319, 324, 327

F1026

2043CH13

 

 

320

48

 

 

318, 320

F1027

2043CH13

 

 

321

49

 

 

318, 320, 324

F1030

2043CH13

 

 

324

50

 

 

318, 324, 324

F1025

2043CH13

 

 

325

51

 

 

318, 325

F1033

2043CH13

 

 

326

52

 

 

326

F1035

2043CH13

 

 

327

53

 

 

327

F1036

2043CH13

 

 

328

54

 

 

328

F1034

2043CH13

 

 

328

55

CS45

2043CH17

 

 

366

56

 

 

365

JMACP

2043CH32

 

 

491

57

 

 

491

Page 649
Image 649
IBM OS/390 manual XRL/3, Jmacp

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.