How Customers Can Get Itso Redbooks

Customers may request ITSO deliverables (redbooks, BookManager BOOKs, and CD-ROMs) and information about redbooks, workshops, and residencies in the following ways:

∙ Online Orders Ð send orders to:

	I B M M A I L	I n t e r n e t
In United States:	usib6fpl at ibmmail	usib6fpl@ibmmail . com
In Canada:	caibmbkz at ibmmail	lmannix@vnet . ibm . com
Outside North America:	dkibmbsh at ibmmail	bookshop@dk . ibm . com

∙Telephone Orders

United States (toll free)				1-800-879-2755
Canada (toll free)				1-800-IBM-4YOU
Outside North America				(long distance charges apply)
(+45)	4810	-1320 - Danish		(+45)	4810	-1020 - German
(+45)	4810-1420		- Dutch	(+45)	4810	-1620	- Italian
(+45)	4810	-1540	- English	(+45)	4810-1270 - Norwegian
(+45)	4810	-1670	- Finnish	(+45)	4810	-1120	- Spanish
(+45)	4810-1220		- French	(+45)	4810	-1170	- Swedish

∙Mail Orders Ð send orders to:

I B M Publications	I B M Publications	IBM Direct Services
Publications Customer Support	144-4th Avenue, S.W.	Sortemosevej 21
P.O. Box 29570	Calgary, Alberta T2P 3N5	DK-3450 Allerùd
Raleigh, NC 27626-0570	Canada	Denmark
USA

∙Fax Ð send orders to:

United States (toll free)		1-800-445-9269
Canada		1-403-267-4455
Outside	North America	(+45) 48 14 2207 (long distance charge)

∙1-800-IBM-4FAX (United States) or (+1)001-408-256-5422 (Outside USA) Ð ask for:

Index # 4421 Abstracts of new redbooks

Index # 4422 IBM redbooks

Index # 4420 Redbooks for last six months

∙On the World Wide Web

Redbooks Web Site	http://www . redbooks . ibm . com/
IBM Direct Publications Catalog	http://www . elink . ibmlink . ibm . com/pbl/pbl

Redpieces

For information so current it is still in the process of being written, look at ²Redpieces² on the Redbooks Web Site (http://www.redbooks.ibm.com/redpieces.html). Redpieces are redbooks in progress; not all redbooks become redpieces, and sometimes just a few chapters will be published this way. The intent is to get the information out much quicker than the formal publishing process allows.

562VSE 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 How Customers Can Get Itso Redbooks, ∙ Telephone Orders, ∙ Fax Ð send orders to

Models: OS/390