Table 13 (Page 2 of 2). POWER/JES2 Output Service Comparison

Output Service

POWER

JES2

JES2 Comments

Function

 

 

 

 

 

 

 

End-of-Page sensing

Y

N

See 10.1.1.6,

 

 

 

ªEnd-of-pageSensingº

 

 

 

on page 209

 

 

 

 

Counting Line Mode

Y (Pages =

Y (Lines)

Set PRINTDEF

Output

skip to Ch.1)

 

NEWPAGE=1

 

 

 

 

Counting Page Mode

Y (Pages)

Y (Pages)

 

Output

 

 

 

 

 

 

 

Restart capability for

Y

Y

Automatic checkpoint

interrupted output

(PRESTART)

 

restart

 

 

 

 

10.3.4.1 Printers Supported

POWER and JES2 support the same set of channel-attached printers:

1403, 3211, 3203, 4245, and 4248 impact printers

3262-5 and 6262 as a 3211

3800-1 for line mode printing

3800-3, 3900, and other AFP printers through PSF

10.3.4.2 Output Segmentation

With POWER, the VSE installation has the ability to segment job output; this provides POWER the ability to print or punch output before a job is finished. It also allows the operator to have operational control over each segment created.

VSE/POWER supports output segmentation by record count thresholds, by specification in the input stream, and by specification in the program. Output segmentation can be used to improve turnaround time for jobs that have large volumes of output.

JES2 supports output segmentation with the SEGMENT= parameter on the SYSOUT DD statement (or on the dynamic allocation request). To support it at the installation level, use a JES2 Exit (6 or 31).

With JES2, job output processing (printing and punching) normally starts when the job completes. The MVS JCL parameter FREE=CLOSE or SPIN=UNALLOC on SYSOUT DD statements can be used to make these files available for printing or NJE transmission as soon as they are closed or unallocated. Then, the output produced for these SYSOUT files is processed when the files are CLOSEd by the application using them. Additionally, the application program can use MVS dynamic allocation services to spin off sections of output for immediate printing.

You can also use the SETPRT macro to schedule the data already written to spool for immediate printing.

10.3.4.3 Tape Spooling

Tape spooling is not supported in JES2. See 10.1.1.3, ªTape Spoolingº on page 208 for some alternatives.

216VSE to OS/390 Migration Workbook

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IBM OS/390 Printers Supported, Output Segmentation, 2 of 2. POWER/JES2 Output Service Comparison, NEWPAGE=1, Prestart

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.