Cloud Computing â âWhats the Buzz? - Ask, Find, Discuss about ...

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screen. Let’s take an example. Let us say thatyou are an executive at a large firm. Yourresponsibility is to provide each employeeworking at your firm with the properinfrastructure. This includes not onlycomputers, but also software and softwarelicense for using them. It becomes a greatheadache for you to buy so many softwareand install them on each computer. There maybe an alternative for executives like you.Instead of installing a suite of software foreach computer, you'd only have to load oneapplication. That application would allowworkers to log into a Web‐based service whichhosts all the programs the user would needfor his or her job. Remote machines owned byanother company would run everything frome‐mail to word processing to complex dataanalysis programs. It's called cloud computing,and it could change the entire computerindustry.Different Levels of Cloud ComputingCloud computing is typically divided into threelevels of service offerings that are describedbelow: Software as a Service (SaaS), Platformas a Service (PaaS), and Infrastructure as aservice (IaaS). These levels supportvirtualization and management of differinglevels of the solution stack.Software as a ServiceA SaaS provider typically hosts and manages agiven application in their own data center andmakes it available to multiple tenants andusers over the Web. Some SaaS providers runon another cloud provider’s PaaS or IaaSservice offerings. Oracle CRM On Demand,Salesforce.com, and Netsuite are some of thewell known SaaS examples.Platform as a ServicePlatform as a Service (PaaS) is an applicationdevelopment and deployment platformdelivered as a service to developers over theWeb. It facilitates development anddeployment of applications without the costand complexity of buying and managing theunderlying infrastructure, providing all of thefacilities required to support the complete lifecycle of building and delivering webapplications and services entirely availablefrom the Internet. This platform consists ofinfrastructure software, and typically includesa database, middleware and developmenttools.Infrastructure as a ServiceInfrastructure as a Service (IaaS) is the deliveryof hardware (server, storage and network),and associated software (operating systemsvirtualization technology, file system), as aservice. It is an evolution of traditional hostingthat does not require any long term6
commitment and allows users to provisionresources on demand. Unlike PaaS services,the IaaS provider does very little managementother than keep the data center operationaland users must deploy and manage thesoftware services themselves‐‐just the waythey would in their own data center. AmazonWeb Services Elastic Compute Cloud (EC2) andSecure Storage Service (S3) are examples ofIaaS offerings.Types of CloudsAs we focus on building the cloud, a numberof models have been developed for deployinga cloud infrastructure.Public CloudsIn a public cloud, external organizationsprovide the infrastructure and managementrequired to implement the cloud. Publicclouds dramatically simplify implementationand are typically billed based on usage. Thistransfers the cost from a capital expenditureto an operational expense and can quickly bescaled to meet the organization’s needs.Temporary applications or applications withburst resource requirements typically benefitfrom the public cloud’s ability to ratchet upresources when needed and then scale themback when they are no longer needed. In aprivate cloud, the company would need toprovision for the worst case across all theapplications that share the infrastructure. Thiscan result in wasted resources whenutilization is not at its peak.Hybrid CloudsPrivate CloudsIn a private cloud, the infrastructure forimplementing the cloud is controlledcompletely by the enterprise. Typically,private clouds are implemented in theenterprise’s data center and managed byinternal resources.A private cloud maintains all corporate data inresources under the control of the legal andcontractual umbrella of the organization. Thiseliminates the regulatory, legal and securityconcerns associated with information beingprocessed on third party computing resources.Currently, private clouds require CapitalExpenditure and Operational Expenditure aswell as highly skilled labor to ensure thatbusiness services can be met.To meet the benefits of both approaches,newer execution models have been developedto combine public and private clouds into aunified solution.Applications with significant legal, regulatoryor service level concerns for information canbe directed to a private cloud. Otherapplications with less stringent regulatory orservice level requirements can leverage apublic cloud infrastructure.Implementation of a hybrid model requiresadditional coordination between the privateand public service management system. Thistypically involves a federated policymanagement tool, seamless hybridintegration, federated security, informationasset management, coordinated provisioningcontrol, and unified monitoring systems.7
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Cloud Computing â âWhats the Buzz? - Ask, Find, Discuss about ...