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IBM OS/390 manual Pcl

Models: OS/390

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ID

Task Name

Projected

 

Actual

 

 

 

 

 

 

 

 

 

Start

End

Start

End

 

 

 

 

 

 

38

Perform Online Application Tests

 

 

06/07/98

08/16/98

 

 

 

 

 

 

39

Perform Online Network & Stress Tests

 

 

08/16/98

08/30/98

 

 

 

 

 

 

40

Refine & Repeat Online Application

 

 

04/26/98

08/23/98

 

Conversion

 

 

 

 

 

 

 

 

 

 

41

Batch Application Conversion

01/09/98

05/10/98

 

 

 

 

 

 

 

 

42

Install Conversion Tools

 

 

01/09/98

01/16/98

 

 

 

 

 

 

43

Install Conversion Software

 

 

01/09/98

01/16/98

 

 

 

 

 

 

44

Batch Program Conversion

 

 

02/01/98

04/26/98

 

 

 

 

 

 

45

Develop COBOL Batch Conversion

 

 

02/01/98

04/12/98

 

Specifications

 

 

 

 

 

 

 

 

 

 

46

Develop Automated COBOL Batch

 

 

02/15/98

04/26/98

 

Conversion

 

 

 

 

 

 

 

 

 

 

47

Perform Manual COBOL Batch Conversion

 

 

04/12/98

04/26/98

 

 

 

 

 

 

48

VSE JCL Conversion

 

 

02/01/98

05/10/98

 

 

 

 

 

 

49

Perform JCL Pilot Conversion

 

 

02/01/98

02/20/98

 

 

 

 

 

 

50

Develop VSE JCL Conversion

 

 

02/01/98

04/26/98

 

Specifications

 

 

 

 

 

 

 

 

 

 

51

Develop VSE JCL Automated Conversion

 

 

02/15/98

05/10/98

 

 

 

 

 

 

52

Perform Manual PCL and JCL Conversion

 

 

04/26/98

05/10/98

 

 

 

 

 

 

53

Perform Initial Mass Conversion (JCL +

 

 

04/26/98

05/10/98

 

PCL)

 

 

 

 

 

 

 

 

 

 

54

OS/390/DFSMS Standards Definition

 

 

02/01/98

04/26/98

 

 

 

 

 

 

55

Develop OS/390/DFSMS Standards

 

 

02/01/98

04/12/98

 

Recommendation

 

 

 

 

 

 

 

 

 

 

56

Present OS/390/DFSMS Standards

 

 

02/15/98

02/15/98

 

Recommendation

 

 

 

 

 

 

 

 

 

 

57

Explain Current VSE Standards

 

 

02/15/98

03/08/98

 

 

 

 

 

 

58

Define New OS/390/DFSMS Standards

 

 

02/15/98

04/26/98

 

 

 

 

 

 

59

OS/390 JCL Generation

 

 

03/01/98

05/10/98

 

 

 

 

 

 

60

Define OS/390 JCL Generation

 

 

03/01/98

04/26/98

 

Specifications

 

 

 

 

 

 

 

 

 

 

61

Develop OS/390 JCL Automated

 

 

03/15/98

05/10/98

 

Conversion

 

 

 

 

 

 

 

 

 

 

62

Batch File Migration

 

 

04/05/98

05/10/98

 

 

 

 

 

 

63

Develop Batch File Migration

 

 

04/05/98

04/19/98

 

Specifications

 

 

 

 

 

 

 

 

 

 

64

Develop Batch File Migration Procedures

 

 

04/19/98

05/10/98

 

 

 

 

 

 

65

Migrate Batch Files for Testing

 

 

04/26/98

05/10/98

 

 

 

 

 

 

66

COBOL VSE Positioning

04/26/98

08/16/98

 

 

 

 

 

 

 

 

67

Identify & Perform COBOL VSE Positioning

 

 

04/26/98

07/19/98

 

 

 

 

 

 

68

Perform, Test & Roll-out COBOL VSE

 

 

05/24/98

08/16/98

 

Positioning

 

 

 

 

 

 

 

 

 

 

69

Batch Test Can Start

 

 

05/10/98

05/10/98

 

 

 

 

 

 

70

Batch Application Tests & Corrections

05/10/98

09/21/98

 

 

 

 

 

 

 

 

71

Perform Sample Batch Tests

 

 

05/10/98

06/05/98

 

 

 

 

 

 

Chapter 3. Developing the Plan

59

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IBM OS/390 manual Pcl
Page 82 Page 84

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.