Resources, Tso/E, 371 VM/ESA | IBM OS/390 specs

resources (continued)
operation		187
remote-resident 240
RESTART with CHKP					173
retrieving output			441
RETURN CODE			341
return codes		73
return codes in PL/I				344
return code values					344
setting return codes						344
RETURN macro			273
reusable data sets				123
Rewind option 173
REXX 163, 242, 369
and SAA		372
and TSO/E		369
and VSE/ESA			369
bibliography			372
CMS sample			371
environments			370
Exec samples			371
migration issues				371
OS/2 sample			371
TSO sample			371
TSO/E	371
VM/ESA 370
VSE/ESA		370
risk management			51
risky VSE coding practices							504
RJE
exits	220
functional differences						219
JES2 operations				452
operations		220
PLINE mapping to JES2 LINE parameters 227
SDSF panels			453
using SDSF panels					453
RMF & other monitors						450
role of automation				460
rolling window definition						578
routine handling			287
RPG II 131, 150, 171
calling COBOL subprograms 331
calling PL/I subprograms							331

IImigration 329 VSAM support 131

RPG II migration to OS/390

calling COBOL subprograms 331 calling PL/I subprograms 331 device information 329

extent exit 330

file access methods 330 print files 329 processing options 330 tape labels 330

RPL macro (additional MVS parameters) 291 run-time options 359, 366

run-time options & LE/VSE 1.1 361

run-time options & LE/VSE 1.4 & later releases 362 RUNMODE macro 290

running converted COBOL programs 265 RVA Snapshop 387

sample MVS JCL				93
sample VSE JCL				92
sample VSE plus carry-over								94
save areas		270
SAVE macro		272
scope of systems management 459
scope of work challenges
application inventory							32
automated operations							37
file migration				35
JCL conversion				33
program conversion						33
project management						37
SDSF 23
and TSO/ISPF				437
device panels				449
operator usage				441
panels	450
panels for NJE				454
panels for RJE				453
system operation					446
secondary index creation							173
secure OS/390 skills					484
security	24, 157, 196, 385
TCP/IP	197
security administrator					181
security management					468
methodology			469
overview		468
tasks	468
segmentation		216
sending commands 234
sending messages				234
separator page difference								208
separator page differences								217
SEQUENCE		336
sequential access method (SAM)									15, 97
sequential file definition on DASD									304
Sequential Insert Strategy								340
serializing job execution							214
ServerPac	406
services	245
services and tools				519
SETPFA macro			290
setting return codes					344
setting up AFP resources							240

migrating print applications

assembler programming interfaces 241 COBOL applications 242

high level language programming interfaces 242

JCL and JECL differences 241

614VSE to OS/390 Migration Workbook

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.

IBM OS/390 manual Resources, Tso/E, 371 VM/ESA, Risk management Risky VSE coding practices 504

Models: OS/390

resources (continued)

TSO/E

371

VM/ESA 370

370

risk management

risky VSE coding practices

504

RJE

TCP/IP

methodology

Sequential Insert Strategy

services

614VSE to OS/390 Migration Workbook

OS/390 specifications