Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 1 Main Frame Computing Objectives Explain why data resides on mainframe.

1

Introduction to the new mainframe

© Copyright IBM Corp., 2006. All rights reserved.

Main Frame Computing

Objectives

• Explain why data resides on mainframe

60% of all data

80 % of Internet Data

• List typical uses of mainframes

• Describe the benefits of mainframe computing

• Outline the major workloads for mainframes

2



Mainframe Characteristics

Centralized control of resources

HW and operating systems share disk access

A STYLE of operation -2 tier computing (logic and data on host)

Thousands of simultaneous I/O operations

Clustering technologies

Data and resource sharing capabilities

3



What is a mainframe ?

Businesses use mainframes to host:

-commercial databases,

-transaction servers, and

-applications that require a greater degree of security and availability

- growing workload from Mobile and Cloud

4



Evolving Mainframe Computer Architecture

More and faster processors... MIMD

More physical memory and greater virtual memory capability

Dynamic capabilities for upgrading HW and SW

Enhanced I/O devices and more and faster paths (channels)

Increased ability to divide resources into multiple, logically independent and isolated systems (LPAR)

Enhanced clustering technologies (e.g. Parallel Sysplex)

5



The Size/Capacity of Mainframes

A Sample Single System Configuration:

- 8 TPF (OS) Images

- Mainframe box with 12 CPUs (I-streams) and

- 32 GB of memory

- shared database of 2,500 Disks with 40 Disk control units

- 2 tape robots used primarily for logging

6



The Size/Capacity of Mainframes

Some Performance numbers for that configuration:- 2 million real I/Os per second to Disk during peak hours

- over 100,000 transactions per second during peak hours.

- 3,380,000,000 (3.38 billion) transactions in 24 hours

CPU capacity complex to execute over 68 billion instructions per second (68,000 MIPS)

7



Availability

An installation quote:

"It has been 4,567 days since the last customer visible outage."

It is now eight months later so the count is now

over 13 years without a customer visible outage.

8



Mainframe facts

Mainframes in our midst• Hidden from the public eye – background servers

Who uses mainframes?• Most Fortune 1000 companies use a mainframe environment • 60% of all data available on the Internet is stored on mainframe

computers

Why mainframes?• Large-scale transaction processing

Thousands of transactions per second

• Support thousands of users and application programs • Simultaneously accessing • Terabytes of information in databases• Large-bandwidth communications

9



Factors contributing to mainframe use

-Capacity

-Scalability

-Integrity and Security

-Availability

-Access to large amounts of data

-Systems management

-Autonomic capabilities (dynamic self management)

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Typical batch use

Disk Storagedatabases

Tape StorageSequential

data sets

Partners and clients exchange

information

Reports

Backups

Data update

Reports

Statistics, summaries, exceptions

ResidenceMain office

Branch offices

Account balances bills, etc

Processingreports

MainframeProcessing batch jobs

44

55

Reports

22

1010

11

88

66

33

CREDIT CARD

1234 5678 90121234 5678 9012VALID FROM GOOD THRU

XX/XX/XX XX/XX/XX

PAUL FISCHER

XX/XX/XX XX/XX/XX

PAUL FISCHER

77

99

SystemOperator

ProductionControl

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Typical online use

Disk storage

controllerStores

database files

queries and

updates

Account activities

Officeautomation

systems

MainframeAccessesdatabase

Requests

ATMs

Branchoffices

Business analysts Inventory control

Branch office automation systems

Network (e.g. TCP/IP or SNA)

55

66

33

22

44

11

Central office

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Summary

The New Mainframe:• Plays a central role in the daily operations of the world’s largest

organizations • Is known for its reliability, security, and enormous processing

capabilities. • Is designed for processing large scale workloads,

with thousands of users, and concurrent transactions • Is managed by highly skilled technical support staff.• Runs a variety of operating systems.

Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 1 Main Frame Computing Objectives Explain why data resides on mainframe.

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