Function

Description

Replacement

 

 

 

SD, SDD

Split-Cylinder Disk Dump

-

 

 

 

SDU

SAM to Diskette

-

 

 

 

SIS

SAM File to ISAM File

-

 

 

 

SP, SPD

Split-Cylinder Disk Print

-

 

 

 

SRS

Split-Cylinder Disk Record Scan

-

 

 

 

TDD

Tape Dump Deblocked

TP

 

 

 

TDU

Tape to Diskette

-

 

 

 

TDV

Tape Dump Variable

TP

 

 

 

TIS

Tape to ISAM File

-

 

 

 

TPD

Tape Print Deblocked

TP

 

 

 

TPV

Tape Print Variable

TP

 

 

 

VDU

VSAM to Diskette File

-

 

 

 

VIS

VSAM to ISAM File

-

 

 

 

20.3 DITTO Functions that are Not Recommended

The following table lists obsolete function codes from previous releases of DITTO that are still recognized by DITTO/ESA in batch mode. It is recommended that you use the indicated replacement.

Function

Description

Replacement

 

 

 

CD

Card Dump

CP

 

 

 

CI

Card to Card Interpreted

CC

 

 

 

DD

Disk Dump

DP

 

 

 

FD

CMS File Dump

FP

 

 

 

LD

Library Member Dump

LP

 

 

 

LI

Library Member to Card Interpreted

LC

 

 

 

OD

Object Dump

OP

 

 

 

QD, SDP

Sequential Data Dump

SP

 

 

 

QI, SI

Sequential Data to Card Interpreted

SC

 

 

 

TD

Tape Dump

TP

 

 

 

TI

Tape to Card Interpreted

TC

 

 

 

VD, VDP

VSAM Dump

VP

 

 

 

VI

VSAM to Card Interpreted

VC

 

 

 

Chapter 20. DITTO 383

Page 407
Image 407
IBM OS/390 manual Ditto Functions that are Not Recommended

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.