distributed systems

Execution Environments for Distributed Computing

Distributed Systems

EEDC

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Master in Computer Architecture, Networks and Systems - CANS

Homework number: 1Group number: EEDC-4

Group members:Arinto Murdopo – arinto@gmail.com

Josep Subirats – josep.subirats@bsc.esJuan Luiz Perez – jperez@bsc.es

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Table of Contents

What are Distributed Systems? Centralized vs Distributed Systems Common Characteristics Case Study: Pfizer

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What are Distributed Systems?

Set of connected computers, which act coordinatedly and share resources to achieve a common goal. Users perceive them as a single entity.

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Centralized vs Distributed Systems

Centralized Systems Distributed Systems

One component with full control Multiple interacting components

Component shared by users all the time

Components are not shared by all users

All resources accessible Resources may not be accessible

Software runs in a single process Software runs in concurrent processes on different processors

Single point of control Multiple points of control

Single point of failure Multiple points of failure

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Common Characteristics

Centralized and Distributed System share common characteristics:Resource SharingOpennessConcurrencyScalabilityFault ToleranceTransparency

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Resource Sharing

Anyone can access everything

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Openness

Standard interfaces allow interoperability

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Concurrency

Access resources simultaneously

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Scalability

System/user can increase easily

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Scalability

System/user can increase easily

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Fault Tolerance

Still working despite failing

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Transparency

Perceived by users and application programmers as a whole rather than as a collection of cooperating components

1.Location

2.Scalability

3.Performance

4.Failure

5.Migration

6.Replication

7.Concurrency

8.Access

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Location Transparency

No need to know where objects are

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Migration Transparency

No need to know if objects are moved

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Case Study: Pfizer

In 2006, they switched to centralized system to distributed system, why?

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Questions and answers