Mumbai University > Information Technology > Sem 7 > Cloud Computing

Marks: 10M

Year: Dec 2015

• Cloud services are demanded by computing and IT administrators, software vendors and end users.
• The above figure introduces five level of cloud players.
• At the top level, individual users and organizational users demand very different services.
• The application providers at the SaaS level serve mainly individual users.
• Most business organizations are serviced by IaaS and PaaS providers.
• The infrastructure services(IaaS) provide the compute, storage and communication resources to both applications and organizational users.
• The cloud environment is defined by the PaaS or platform providers.
• Cloud services rely on new advances in machine virtualization, SOA, grid infrastructure management and power efficiency.
• Consumers purchase such services in the form of IaaS, PaaS or SaaS.
• Many cloud entrepreneurs are selling value added utility services to massive number of users.
• The cloud industry leverages the growing demand by many enterprises and business users to outsource their computing and storage jobs to professional providers.
• The provider service charges are often much lower than the cost for users to replace their obsolete servers frequently.

• The above figure shows IaaS, PaaS and SaaS models which allow the users to access services over the internet relying entirely on the infrastructures of cloud service providers.
• These models are offered based on various SLAs between the providers and the users.
• SLAs are more common in network services as they account for the QoS characteristics of network services.
• For cloud computing services, it is difficult to find a reasonable precedent for negotiating an SLA.

The SLA for cloud computing address service availability, data integrity, privacy and security protection.