Some additional words
about cloud computing
Lionel Brunie
National Institute of Applied Science (INSA)
LIRIS Laboratory/DRIM Team – UMR CNRS 5205
Lyon, France
http://liris.cnrs.fr/lionel.brunie
PhD course - Milan, March 2010 - 31/07/2017
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What’s a Cloud ?
"A Cloud is a type of parallel and distributed system consisting of
a collection of interconnected and virtualized computers that are
dynamically provisioned and presented as one or more unified
computing resources based on service-level agreements
established through negotiation between the service provider and
consumers” (Buyya et al.)
“A large-scale distributed computing paradigm that is driven by
economies of scale, in which a pool of abstracted, virtualized,
dynamically-scalable, managed computing power, storage,
platforms, and services are delivered on demand to external
customers over the Internet” (Foster et al.)
Start point: October/November 2007 - IBM Blue Cloud
PhD course - Milan, March 2010 - 31/07/2017
2
Visit of a Cloud vendor web site
http://www.ibm.com/ibm/cloud/
« Values to customers include:
Reducing
IT management complexity and skill
requirements
Sharing resources among multiple applications
Accelerating application launches
Supporting both existing and emerging, data-intensive
workloads
»
PhD course - Milan, March 2010 - 31/07/2017
3
Example: Amazon EC2/S3
Compute Cloud EC2 (Elastic Cloud Computing)
 « Private » virtualized servers (« instances ») of different types
 Example: High-CPU Extra Large Instance
 7 GB of memory
 20 EC2 Compute Units
 1690 GB Storage
Pricing on a per hour basis for each instance type: from $0.084/hour for
the smallest "On-Demand" virtual machine running Linux to 12x more for
the largest one running Windows (Nov. 2009). The data transfer charge
ranges from $0.08 to $0.15 per gigabyte, depending volume
Data Cloud S3 (Simple Storage Service)
 from $0.55 to $0.15 per GB-month, + bandwidth usage (from $0.08 to 0.15
per GB) + requests (from $0.01 to $0.1 per 1000 requests)
 102 billion objects stored files (March 2010)
 data transfer is charged by TB / month data transfer, depending on the
source and target of such transfer.
PhD course - Milan, March 2010 - 31/07/2017
4
IaaS, PaaS, SaaS
Infrastructure as a Service (IaaS)
 provides computing environments/infrastructure i.e., hardware, software
 the provisioned infrastructure can dynamically scale up and down depending
on the actual needs
 Amazon EC2 and S3
Platform as a Service (PaaS)
 high-level integrated environment to build and deploy applications
 restrictions on the type of applications
 but scalable platform
 Google’s App Engine for deploying Web applications
Software as a Service (SaaS)
 delivers software to consumers through the Internet
 Salesforce: online CRM (Customer Relationship Management) Services ;
Live Mesh from Microsoft: files and folders synchronization
PhD course - Milan, March 2010 - 31/07/2017
5
Characteristics
From the customer point of view:
Scalability
Reliability
Security and Privacy
Ubiquitous and fast access
Quality of Service
Service Level Agreement
Pricing system
Simple to use
From the internal point of view
Virtualization
« Grid » management
PhD course - Milan, March 2010 - 31/07/2017
6
Comparison of some cloud platforms
From Foster et al.
PhD course - Milan, March 2010 - 31/07/2017
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A market oriented vision
of a cloud based IT world
From Buyya et al.
PhD course - Milan, March 2010 - 31/07/2017
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