Computers Are Your Future Twelfth Edition

Report
Computers Are Your Future
Twelfth Edition
Spotlight 5: Cloud Computing
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall
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Cloud Computing
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What is Cloud
Computing?
• Cloud computing
o Hosting computers, or cloud providers, deliver
services to subscribers over the Internet
o Five general characteristics
• On-demand self-service
• Broad network access
• Resource pooling
• Rapid elasticity
• Measured service
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What is Cloud
Computing?
• Cloud computing (con’t.)
o Hosting computers (servers) and subscribers
(clients) main components—just as with
client/server network
o Three major differences:
• Delivery of services must be over the Internet
• Services are scalable
• Services are managed completely by the cloud
provider, the owner, or manager of the host
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Cloud Computing
Service Categories
• Infrastructure-as-a-Service (IaaS)
o Outsourcing of hardware—equipment used to sustain
the operations of a company or enterprise
o Hardware-as-a-Service (HaaS)
o Virtual datacenter
o Main factors in the use of IaaS:
• Reduced budget outlay
• Fast time to market with programs and ideas
• Reassignment of IT personnel
• Replacement of unknown with known costs
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Cloud Computing
Service Categories
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Cloud Computing
Service Categories
• Platform-as-a-Service (PaaS)
o Permits subscribers to have remote access to:
• Application development
• Interface development
• Database development
• Storage and testing
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Cloud Computing
Service Categories
• Software-as-a-Service (SaaS)
o Enables software to be deployed from provider,
delivered over the Internet, and accessed by subscriber
o Primary reason to subscribe:
• Limited risk
• Rapid deployment
• Fewer upfront costs
• Increased reliability
• Standardized backup procedures
• Lower total cost of ownership (TCO)
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Cloud Computing
Service Categories
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Cloud Deployment
Methods
• Three basic types of deployment models:
o Private cloud
o Public cloud
o Hybrid cloud
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Cloud Deployment
Methods
• Type of cloud deployment may be directly
related to security.
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Pros and Cons of
Cloud Computing
• Pros of cloud computing
o Scale and cost
• Organization doesn’t have to purchase equipment, license
software, and hire personnel
o Encapsulated change management
• Hardware and associated technology can be maintained,
redistributed, and redirected without major reconfiguration
o Choice and agility
• Subscriber deploys solutions that best suit current needs
and trends
o Next-generation architectures
• Innovation and foresight in IT are not a threat to the
bottom line or current operations
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Pros and Cons of
Cloud Computing
• Cons of cloud computing
o Lock-in
• Able to switch providers without losing ability to access
data
o Reliability
• Provider could lose power, run into trouble, burn down, or
simply go out of business
o Lack of Control
• Control of resources is surrendered to someone in the
cloud
o Security
• Concerns are centered on data being stored on servers
owned and controlled by the cloud provider
• Results in compromise between cost and risk management
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Pros and Cons of
Cloud Computing
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The Future of
Cloud Computing
• Statistics from an IDC report:
o Cloud computing growing at a rate five times greater
than any traditional IT product
o Cloud applications were the main service in 2009. By
2014, a projection shows a decrease in SaaS; an
increase in IaaS and PaaS
o By 2014, worldwide revenue from public IT cloud
computing could exceed $55.5 billion.
o By 2014, the U.S. will receive 51.4% of the cloud
services revenue, Western Europe and the Asia/Pacific
regions will make gains.
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The Future of
Cloud Computing
• Guidelines for the growth of an
open cloud
o Open Cloud Manifesto (2009) guidelines:
• Providers must work together and collaborate
• Providers must not lock subscribers into its
platform, removing freedom of choice
• Providers should reduce repetition of standards
• Any changes to standards should be driven by
the needs of the subscriber, not the provider
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The Effect of Cloud
Computing on the
Enterprise
• The effect of cloud computing:
o IT costs will be more directly related to value.
o IT departments will be more agile.
o The need to stay current with businesses and customer
demands and requests is pushing the cloud toward realtime switching among cloud resources.
• Real-time switching is the seamless moving of
workloads between private and public clouds to
maximize the best value available.
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All rights reserved. No part of this publication may be reproduced, stored in a
retrieval system, or transmitted, in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, without the prior written
permission of the publisher. Printed in the United States of America.
Copyright © 2012 Pearson Education, Inc.
Publishing as Prentice Hall
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall
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