a brief look at ibm mainframe history

Business Unit or Product Name

© 2003 IBM CorporationIBM Confidential

A brief look at IBM mainframe history

24-08-2007

Siva Prasanth Rentala

IGSI, TPO,PUNE.

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© 200 ３ IBM Corporation

IBM Confidential

A brief look at IBM mainframe history

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System 360

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System 360On April 7, 1964 IBM introduced System/360, a family of five increasingly

powerful computers that ran the same operating system and could use the same44 peripheral devices.

For the first time, companies could run mission-critical applications for business on a highly secure platform.

In 1969, Apollo 11's successful landing on the moon was supported by several.

System 360s, Information Management System (IMS) 360 and IBM software.

In 1968, IBM introduced Customer Information Control System (CICS). It allowed workplace personnel to enter, update, and retrieve data online. To date, CICS remains one of the industry's most popular transaction monitors.

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System 370

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System 370

In the summer of 1970, IBM announced a family of machines with an enhanced instruction set, called System/370. These machines were capable of using more than one processor in the same system (initially two), sharing the memory.

Through the 1970s the machines got bigger and faster, and multiprocessorsystems became common.

Able to run System/360 programs, thus easing the upgrade burden forcustomers, System/370 was also one of the first lines of computers to include“virtual memory” technology.

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3081 processor complex

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3081 processor complex

1980 saw the introduction of the 3081 processor. The 3081 offered a two-fold increase in internal performance from the previous mainframe processor, the 3033. It also featured Thermal Conduction Modules (TCMs) that significantly reduce space, cooling, and power requirements.

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Pundits thought mainframes will not exist 1990.

Some industry pundits, however, didn't think the mainframe would

survive the early 1990s. They predicted that the rapid growth in

personal computers and small servers would render “Big Iron”

(industry jargon for mainframe) obsolete.

But IBM believed that serious, security-rich, industrial-strength

computing would always be in demand, hence System/390. IBM

stuck with the mainframe, but reinvented it from the inside,

infusing it with an entirely new technology core and reducing its

price.

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S390 G5 and G6

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S390 G5 and G6

IBM introduced the concept of System Clustering and Data Sharing, andannounced System/390 Parallel Sysplex, which made possible very high levels of system availability.

Still in 1999, IBM introduced the first enterprise server to use IBM's innovative copper chip technology. The synergy helped extend customers' ability to handle millions of e-business workload transactions and large-scale Enterprise Resource Planning applications. A new concept arose at that time, the possibility to increase the machines’ capacity without stopping them.

FICON, a new fiber optic channel was introduced with up to eight times the capacity of ESCON channels. Also in 1999, Linux appeared on System/390 for the first time.

Also in 1999, Linux appeared on System/390 forthe first time.

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zSeries mainframes

In October 2000, IBM announced the first generation of the zSeries mainframes.

The z/Architecture is an extension of ESA/390 and supports 64-bit addressing.

Dynamic channel management was also introduced, as well as specializedcryptographic capability. The mainframe became “open” and capable ofexecuting Linux; special processors (IFLs) were developed.

z900 was launched in 2000 and was the first IBM server “designed from theground up for e-business.”

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zSeries mainframes

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Z 990

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Z 990

zSeries is based on the 64-bit z/Architecture, which is designed to reducememory and storage bottlenecks and which can automatically direct resources to priority workloads through Intelligent Resource Director (IRD). IRD is a key feature of the z/Architecture.

The z990 provides a multibook system structure that supports the configuration of one to four books.

Each book is comprised of a Multiple Chip Module (MCM) with 12 processors, of which eight can be configured as standard processors; memory cards that can support up to 64 GB of memory per book; and high performance Self-Timed Interconnects. The maximum number of processors available on a z990 is 32.

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z9-109

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z9-109

The latest generation of mainframes, the IBM System z9 109 (also known as the z9-109) is the next step in the evolution of the IBM mainframe family. It uses the z/Architecture and instruction set (with some extensions) of the z900 and z990 servers.(This architecture, formerly known as ESAME Architecture, is commonly570 Introduction to the New Mainframe: z/OS Basicsknown as 64-bit architecture, although it provides much more than 64-bitcapability.)The physical appearance of the z9-109 server and z990 servers isvery similar. However, in addition to extending zSeries technology, the z9-109server delivers enhancements in the areas of performance, scalability,availability, security and virtualization.

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z9-109

The z9-109 server continues such growth by providing a significantly higher-performance option for channel programming.

Examples of further mainframe evolution in the z9-109 include:

A modular multi-book design that supports one to four books and up to 54processor units (customer-usable PUs) per server Full 64-bit real and virtual storage support, and any logical partition can be defined for 31-bit or 64-bit addressability Up to 512GB of system memory Up to 60 logical partitions

In previous generations of mainframes, the number of I/O devices in a systemwas limited by the number of channels, the number of control units on eachchannel, and the number of devices on each channel. The addressing structurealso provided a limitation. The fixed three-byte addresses (one byte each forchannel, control unit, and device) of early systems evolved into four-byte devicenumbers allowing up to almost 64K device addresses. The z9-109 servercontinues this growth by providing Multiple Subchannel Sets (MSS), allowing upto almost 128K device addresses.

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Few Technologies on mainframe.

AS

AS/400

Assembler

Brio

ChangeMan

CICS

CLIST

COBOL

CoolGen

CSP

DB2

DFSORT

Easytrieve

Endevor

FileAid

IDMS

IMS

Java

Java Script

JCL

ICM

OpenSource

Mainframe

VB

SOA

ODBC

ITS

Web2.0

UsefulSoftware

Focus

PLI

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Here am trying to list the companies who deal with mainframes. I hope it will be useful. INFOSYS

HCL ACCENTURE TCS IBM PATNI KANBY CTS COVANYS EDS WIPRO POLARIS L&T VETTRI SATHYAM/PCS MASCON SYNTEL XANSA HCL HPS4 Ford Hexaware verizon Mpowerss MASTEK ANZ

Iflex CGI HSBC MPHASIS MBT CITI BANK COLES MYERS DETUSCHE BANK NET CRAFT INFINITY PHENIX EFUNDS MINDTREE MINDTEK FEDILITY TIMKEN DIGITAL KEANE POLARIS MAJORIS US Software Macro Soft Nest

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THANK YOU

a brief look at ibm mainframe history

Education

ibm announced

109 server continues

z990 servers

linux appeared

zseries mainframes

channel

introduced

mainframes