1. Business Unit or Product Name
© 2003 IBM CorporationIBM Confidential
Sivaprasanth Rentala
SA3-1-77,Bangalore
Welcome to have to think “Who
says elephants can’t dance on System Z
mainframe (Zero down time) computing!”

2. Business Unit or Product Name
© 2003 IBM CorporationIBM Confidential
Introduction to
z/OS and the
mainframe
environment
Welcome to mainframe computing!
As a technical professional in the world of mainframe computing,
you will need to understand how mainframe computers support your
company’s IT infrastructure and business goals..
In banking, finance, health care, insurance, public utilities, government, and a
multitude of other public and private enterprises, the mainframe computer
continues to form the foundation of modern business.
The long-term success of mainframe computers is without precedent (ex) in the
information technology (IT) field. Periodic upheavals (disturbance) shake world econom
and
continuous—often wrenching (pull)—change in the Information Age has claimed many
once-compelling innovations as victims in the relentless (harsh) march of progress.
Why has this one form of computing taken hold so strongly among so many of
the world’s corporations?

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A brief look at IBM mainframe history

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The S/360: A turning point in mainframe history
System/360 the first general Purpose computer, introduced in
1964.
Mainframes (often colloquially referred to as Big Iron )
are computers used mainly by large organizations
for critical applications, typically bulk data processing such as census,
industry and consumer statistics, ERP, and financial transaction
processing.
The IBM System/360 (S/360) is a mainframe computer system family
announced by IBM on April 7, 1964.
The chief architect of the S/360 was Gene Amdahl, and the project was
managed by Fred Brooks, under Chairman Thomas J. Watson Jr.[2]
IBM actually delivered fourteen models, including rare one-off models
for NASA.

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System 360
On 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.
IBM introduced Information Management System (IMS) & 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
The IBM System/370 (often: S/370) was a model range of IBM
mainframes announced on June 30, 1970 as the successors to the
System/360 family.
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
multiprocessor
systems became common.
Able to run System/360 programs, thus easing the upgrade burden for
customers, System/370 was also one of the first lines of computers to
include
“virtual memory” technology.

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Enterprise Systems Architecture/390 - System 390
The System/370 line was replaced by the System/390 in the 1990s, and the
architecture was similarly renamed from ESA/370 to ESA/390. This was
essentially just a rename for marketing reasons, rather than major
architectural change.
I.B.M. overhauled the insides of the mainframe, using low-cost
microprocessors as the computing engine.
The company invested and updated the mainframe software, so that banks,
corporations and government agencies could still rely on the mainframe as
the rock-solid reliable and secure computer for vital transactions and data,
while allowing it to take on new chores like running Web-based programs.

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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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© 2003 IBM CorporationIBM Confidential
Introduction to z/OS and the mainframe environment
IBM System z, or earlier IBM eServer zSeries, is a brand
name designated by IBM to all its mainframe computers.
In 2000, IBM rebranded the existing System/390 to IBM
eServer zSeries with the e depicted in IBM's red
trademarked symbol.

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System Z features IBM zSeries:
http://www-03.ibm.com/systems/resources/servers_eserver_zseries_library_white
System Z features:
 Web, J2EE, Linux and Java development
 z/OS and Unix system services development
 Windows development
 Composite development
 Testing and deployment
 Relational database
 Globalization support
 Technology previews

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System Z Models (chronological order)
The older S/390 IBM mainframe servers are considered history since
support for the last S/390 compatible version of z/OS (1.5) was
dropped on March 31, 2007.
zSeries mainframes:
 z900 (2064 series), for larger customers (2000)
 z800 (2066 series), entry-level, less powerful variant of the z900
(2002)
 z990 (2084 series), successor to larger z900 models (2003)
 z890 (2086 series), successor to the z800 and smaller z900 models
(2004)
System z9 mainframes:
 z9 Enterprise Class (2094 series), introduced in 2005 initially as z9-
109, beginning the new System z9 line
 z9 Business Class (2096 series), successor to the z890 and
smallest z990 models (2006)
System z10 mainframe:
 z10 Enterprise Class (2097 series), introduced on February 26,
2008

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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
specialized
cryptographic capability. The mainframe became “open” and capable
of
executing Linux; special processors (IFLs) were developed.
z900 was launched in 2000 and was the first IBM server “designed
from the
ground up for e-business.”

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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
Java
Java Script
JCL
ICM
OpenSource
Mainframe
VB
SOA
ODBC
ITS
Web2.0
UsefulSoftware
Focus
PLI

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The companies who deal with Z mainframes.
INFOSYS
HCL
ACCENTU
RE
TCS
IBM
PATNI
KANBY
CTS
COVANYS
EDS
WIPRO
POLARIS
L&T
VETTRI
SATHYAM/
PCS
MASCON
SYNTEL
XANSA
HCL
HPS4
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
etc.

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THANK YOU