4a. Aula 2o. Período de 2013. Livro texto Copyright © 2012, Elsevier Inc. All rights reserved. 4 - 3 March 5, 2012 Prof. Kai Hwang, USC Cloud Roles in.

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Presentation transcript:

4a. Aula 2o. Período de 2013

Livro texto

Copyright © 2012, Elsevier Inc. All rights reserved March 5, 2012 Prof. Kai Hwang, USC Cloud Roles in The Future Internet (Courtesy of G. Xie and Z. Li 2012)

Copyright © 2012, Elsevier Inc. All rights reserved Subscription -Oriented Cloud Services X (compute, apps, data,..) as a Service (.. aaS) Clients Other Cloud Services Govt. Cloud Services Private Cloud Cloud Manager Public Cloud (Courtesy of Raj Buyya, 2012)

Copyright © 2012, Elsevier Inc. All rights reserved  Historical roots in today’s Internet apps ○ Search, , social networks ○ File storage (Live Mesh, Mobile Me, Flicker, …)  A cloud infrastructure provides a framework to manage scalable, reliable, on-demand access to applications  A cloud is the “invisible” backend to many of our mobile applications  A model of computation and data storage based on “pay as you go” access to “unlimited” remote data center capabilities (Courtesy of Geoffrey Fox, 2012)

Copyright © 2012, Elsevier Inc. All rights reserved Three Aspects in Hardware that can benefit from Cloud Computing 1. The illusion of infinite computing resources available on demand, thereby eliminating the need for cloud users to plan far ahead for resource provisioning. 2. The elimination of an up-front commitment by cloud users, thereby allowing companies to start small and increase the hardware resources when needed in the future. 3. The ability to pay the costs of computing resources on a short- term basis as needed (e.g., processors by the hour and storage by the day) and release them after done and thereby rewarding resource conservation. (Courtesy of M. Ambrust, et al 2009)

Copyright © 2012, Elsevier Inc. All rights reserved

Copyright © 2012, Elsevier Inc. All rights reserved

Copyright © 2012, Elsevier Inc. All rights reserved Cloud Computing as A Service [9]

Copyright © 2012, Elsevier Inc. All rights reserved Public Clouds vs. Private Clouds : Characterist ics Public cloudsPrivate clouds Technology leverage and ownership Owned by service providers Leverage existing IT infrastructure and personnel; owned by individual organization Management of provisioned resources Creating and managing VM instances within proprietary infrastructure; promote standardization, preserves capital investment, application flexibility Client managed; achieve customization and offer higher efficiency Workload distribution methods and loading policies Handle workload without communication dependency; distribute data and VM resources; surge workload is off-loaded Handle workload dynamically, but can better balance workloads; distribute data and VM resources Security and data privacy enforcement Publicly accessible through remote interface Access is limited; provide pre- production testing and enforce data privacy and security policies Example platforms Google App Engine, Amazon AWS, Microsoft Azure IBM RC2

Copyright © 2012, Elsevier Inc. All rights reserved Today’s Cloud Services Stack Network Cloud Services Co-Location Cloud Services Compute & Storage Cloud Services Platform Cloud Services Application Cloud Services (Courtesy of T. Chou, 2010)

Copyright © 2012, Elsevier Inc. All rights reserved Some IaaS Offerings from Public Clouds :

Copyright © 2012, Elsevier Inc. All rights reserved PaaS Offerings from Public Clouds

Copyright © 2012, Elsevier Inc. All rights reserved Enabling Technologies for The Clouds

Copyright © 2012, Elsevier Inc. All rights reserved Challenges in Cloud Computing (1) Concerns from The Industry (Providers)  Replacement Cost  Exponential increase in cost to maintain the infrastructure  Vendor Lock-in  No standard API or protocol can be very serious  Standardization  No standard metric for QoS is limiting the popularity  Security and Confidentiality  Trust model for cloud computing  Control Mechanism  Users do not have any control over infrastructures

Copyright © 2012, Elsevier Inc. All rights reserved Challenges in Cloud Computing (2) Concerns from Research Community :  Conflict to legacy programs  With difficulty in developing a new application due to lack of control  Provenance  How to reproduce results in different infrastructures  Reduction in Latency  No specially designed interconnect used  Very low controllability in layout of interconnect due to abstraction  Programming Model  Hard to debug where programming naturally error-prone  Details about infrastructure are hidden  QoS Measurement  Especially for ubiquitous computing where context changes

Copyright © 2012, Elsevier Inc. All rights reserved Cloud is built on Massive Datacenters Range in size from “edge” facilities to megascale (100K to 1M servers) Economies of scale Approximate costs for a small size center (1K servers) and a larger, 400K server center. This data center is 11.5 times the size of a football field TechnologyCost in small- sized Data Center Cost in Large Data Center Ratio Network$95 per Mbps/ Month $13 per Mbps/ month 7.1 Storage$2.20 per GB/ Month $0.40 per GB/ month 5.7 Administra- tion ~140 servers/ Administrator >1000 Servers/ Administrator 7.1 (Courtesy of Dennis Gannon, 2010)

Copyright © 2012, Elsevier Inc. All rights reserved

Copyright © 2012, Elsevier Inc. All rights reserved

Copyright © 2012, Elsevier Inc. All rights reserved Top 10 Obstacles and Opportunities for Cloud Computing (Courtesy of M. Ambrust, et al 2009)

Copyright © 2012, Elsevier Inc. All rights reserved Cost-Effectiveness in Cloud Computing vs. Datacenter Utilization (Courtesy of M. Ambrust, et al 2009)

Copyright © 2012, Elsevier Inc. All rights reserved Table 2: Economies of Scale in 2006 for medium-sized datacenter (1000 servers) vs. very large datacenter (50,000 servers). [24] (Courtesy of M. Ambrust, et al 2009)

Copyright © 2012, Elsevier Inc. All rights reserved Cost Considerations : Power, Cooling, Physical Plant, and Operational Costs (Courtesy of M. Ambrust, et al 2009)