IntroductionInformation Technology is in theearly stages of a dramatic shiftfrom client/server architecture tocloud computing, a shift thatpromises not just cheapercomputing, but alsofaster, easier, more flexible, andmore effective computing.
Cloud DefinitionCloud computing enables accessthrough the Internet to a sharedpool of computing resources(hardware, software etc.) that canbe tapped on demand and configuredand scaled up or down as needed.
Cloud CategoriesThere are three main categories of the cloud -1. Software as Service (Saas), in which users "rent"access to software application functionality (e.g.CRM, email) over the internet2. Platform as a Service (Paas), in which users developand/or run their own applications in a cloud platformenvironment, with the provider managing the operatingsystem, storage, hardware and networking3. Infrastructure as a Service (IaaS), in which users runall their own systems, including operating systems etc., ona cloud providers infrastructure
Benefits of the Cloud1. Increased business agility2. Flexible Capacity3. Faster adoption of new technology4. Lower fixed costs (shift from capitalexpenditure to operational expenditure)5. Lower up-front costs todevelop/delpoy IT systems6. Always on newest versions of softwarewithout IT updates/patches
Advantages of Cloud1. Let us experiment more easily at lowcost2. Enables deeper collaboration withbusiness partners3. Frees up IT resources to work on morestrategic things4. Is a source of competitive advantagefor early adopters5. Lowers the cost of doing business
Types of Cloud Usage1. Public - Computing Resources areexternally hosted by a third-partyservice provider, shared with otherorganizations, provisioned dynamically andbilled based on use2. Private - Cloud environment is notshared with other organizations3. Hybrid - Operates in both public andprivate cloud environments
Significant Concerns1. Data Security2. Reliability/business continuity3. Legal/Compliance issues4. Lack of interoperability with existingIT systems5. Vendor lock-in6. Lack of control7. Lack of transperency8. Lack of standards