Cloud computing

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Cloud computing

  1. 1. Cloud Computing 10/29/2010 Management of information system 1
  2. 2. INTRODUCTION • Cloud computing is Internet-based computing, whereby shared resources, software, and information are provided to computers and other devices on demand. • This frequently takes the form of web-based tools or applications that users can access and use through a web browser as if it were a program installed locally on their own computer. 10/29/2010 Management of information system 2
  3. 3. INTRODUCTION • Most cloud computing infrastructures consist of services delivered through common centers and built on servers. • Clouds often appear as single points of access for all consumers' computing needs. • The major cloud service providers include 10/29/2010 Management of information system 3
  4. 4. Characteristics • Customers do not own the physical infrastructure. • They consume resources as a service and pay only for resources that they use. • Sharing "perishable and intangible" computing power among multiple tenants can improve utilization rates, as servers are not unnecessarily left idle (which can reduce costs significantly while increasing the speed of application development). 10/29/2010 Management of information system 4
  5. 5. THREE KINDS OF CLOUD SERVICES 10/29/2010 Management of information system 5
  6. 6. Software as a Service (SaaS) • A Software that is deployed over the internet. • A SaaS application runs entirely in the cloud that is, on servers at an Internet-accessible service provider. • The on-premises client is typically a browser or some other simple client. 10/29/2010 Management of information system 6
  7. 7. Example of a SaaS applications 10/29/2010 Management of information system 7
  8. 8. Attached Services • An on-premises application can sometimes enhance its functions by accessing application- specific services provided in the cloud. • Because these services are usable only by this particular application, they can be thought of as attached to it. • One popular consumer example of this is Apple’s iTunes: The desktop application is useful for playing music and more, while an attached service allows buying new audio and video content. 10/29/2010 Management of information system 8
  9. 9. Example of Attached Services 10/29/2010 Management of information system 9
  10. 10. Cloud Platforms or Platform as a Service (PaaS) • A cloud platform provides cloud-based services for creating applications. • Rather than building their own custom foundation, for example, the creators of a new SaaS application could instead build on a cloud platform. 10/29/2010 Management of information system 10
  11. 11. Example of Cloud Platforms or Platform as a Service (PaaS) 10/29/2010 Management of information system 11
  12. 12. Comparisons • Autonomic computing — "computer systems capable of self- management". • Client–server computing refers broadly to any distributed application that distinguishes between service providers (servers) and service requesters (clients). • Grid computing — "a form of distributed computing and parallel computing, whereby a 'super and virtual computer' is composed of a cluster of networked, loosely coupled computers acting in concert to perform very large tasks“ • Peer-to-peer – a distributed architecture without the need for central coordination, with participants being at the same time both suppliers and consumers of resources. 10/29/2010 Management of information system 12
  13. 13. 4 Cloud Deployment Models • Private cloud – enterprise owned or leased • Community cloud – shared infrastructure for specific community • Public cloud – Sold to the public, mega-scale infrastructure • Hybrid cloud – composition of two or more clouds 10/29/2010 Management of information system 13
  14. 14. Cloud Definition Framework 14 CommunityCommunity CloudCloudPrivate CloudPrivate Cloud Public CloudPublic Cloud Hybrid Clouds Deployment Models Service Models Essential Characteristics Common Characteristics Software as a Service (SaaS) Platform as a Service (PaaS) Infrastructure as a Service (IaaS) Resource Pooling Broad Network Access Rapid Elasticity Measured Service On Demand Self-Service Low Cost Software Virtualization Service Orientation Advanced Security Homogeneity Massive Scale Resilient Computing Geographic Distribution 10/29/2010 Management of information system
  15. 15. Key features • Agility improves with users' ability to rapidly and inexpensively re-provision technological infrastructure resources. • Cost is claimed to be greatly reduced and capital expenditure is converted to operational expenditure. • Device and location independence enable users to access systems using a web browser regardless of their location or what device they are using (e.g., PC, mobile). 10/29/2010 Management of information system 15
  16. 16. Key features (Cont.) • Multi-tenancy enables sharing of resources and costs across a large pool of users thus allowing for: – Centralization of infrastructure in locations with lower costs (such as real estate, electricity, etc.) – Peak-load capacity increases (users need not engineer for highest possible load-levels) – Utilization and efficiency improvements for systems that are often only 10–20% utilized. 10/29/2010 Management of information system 16
  17. 17. Key features (Cont.) • Security could improve due to centralization of data, increased security-focused resources, etc., but concerns can persist about loss of control over certain sensitive data, and the lack of security for stored kernels. • Security is often as good as or better than under traditional systems, in part because providers are able to devote resources to solving security issues that many customers cannot afford. 10/29/2010 Management of information system 17
  18. 18. Key features (Cont.) • Maintenance cloud computing applications are easier to maintain, since they don't have to be installed on each user's computer • The cloud is becoming increasingly associated with small and medium enterprises (SMEs) as in many cases they cannot justify or afford the large capital expenditure of traditional IT. 10/29/2010 Management of information system 18
  19. 19. Issues • Privacy: Companies hosting the Cloud services control, and thus, can monitor at will, lawfully or unlawfully, the communication and data stored between the user and the host company. • Security: – The relative security of cloud computing services is a contentious issue which may be delaying its adoption. – Some argue that customer data is more secure when managed internally, while others argue that cloud providers have a strong incentive to maintain trust and as such employ a higher level of security 10/29/2010 Management of information system 19
  20. 20. Issues • Availability and Performance: – Businesses are worried about acceptable levels of availability and performance of applications hosted in the cloud. – There are also concerns about a cloud provider shutting down for financial or legal reasons, which has happened in a number of cases. 10/29/2010 Management of information system 20
  21. 21. Issues • Sustainability and siting • Cloud computing is often assumed to be a form of "green computing" • Siting the servers affects the environmental effects, of cloud computing. • In areas where climate favors natural cooling and renewable electricity is readily available, the environmental effects will be more moderate. • Thus countries with favorable conditions, such as Finland, Sweden and Switzerland, are trying to attract cloud computing data centers. 10/29/2010 Management of information system 21
  22. 22. Cloud Computing in HR Services Being Offered Presently Leave Application system Payroll System Employee data management E-Forms Booking of company resources Performance and talent management modules Training and development modules etc. 10/29/2010 Management of information system 22
  23. 23. Some examples….. 10/29/2010 Management of information system 23
  24. 24. THANK YOU 10/29/2010 Management of information system 24

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