What is Cloud Computing?
Simple definition
Wikipedia :
Cloud computing refers to the :provision of computational resources on demand via a computer network
.What is Cloud Computing?
A way of computing, via the Internet.
Shares computer resources instead of using software or storage on a local PC.
No need to install documents, software, Operating system.
A physical storage center is no longer needed.
A way to access Applications hosted on the web through your
web browser.
Consist of Virtual Platform (OS) , Software and infrastructures.
Only need is High-Speed Internet.
Key Features
Greatly reduced Cost on purchasing diff kinds of Software , operating system etc.
No need to be purchased for one-time or infrequent computing tasks.
Pricing of any services is compute on usage-based options
Fewer IT skills are required for implementation (in-house) .
o Location independence enable to access systems using web browser o Regardless of their location or device they are using (e.g. PC, mobile).
o Accessed via the Internet, users can connect from anywhere.
• Improve due to a specialized company taking care of the data
• Security is greatly increased when data is distributed over a no. of devices & Area
Utilization and efficiency improvements for systems that are often only 10–20% utilized.
Suitable for Business continuity and disaster recovery.
IT and business managers can at times do little when they are affected.
Key Features
Applications are easier to maintain, since they don't have to be installed on each user's computer.
Easier to support and to improve since the changes reach the clients instantly You will be Up to date.
The following sites have been very useful…
Type Of Services
• Customers rent software hosted by the vendor.
SaaS
Software-as-a-Service
• Customers rent infrastructure and programming tools hosted by the vendor.
PaaS
Platform-as-a-Service
• Customers rent processing, storage, networking and other fundamental computing resources
IaaS
Infrastructure-as-a-Service
SaaS
Software-as-a-Service
It's all On Demand
Rich Internet application web sites
Office Productivity
• E.g.: Flickr, Salesforce.com, Cisco WebEx office, Gmail, IBM
PaaS
Virtual Development-platform-as-a-service Database
App Servicer
Reduce cost of buying & managing S/w & H/w
Example : Google App Engine, Microsoft SQL Server Data Services, Engine Yard, Salesforce.com’s Force.com
IaaS
• Backbone of Entire system
• Physical storage space
• Processing capabilities
• Systems Management
• E.g.: Akamai, Amazon EC2, CohesiveFT, Mosso, Joyent Accelerators
Deployment Models
Benefits
Utility Pricing
Benefits
They own the hardware
They maintain the system
They train and support users
Benefits
The user provides space, power, and bandwidth.
And they take care of the rest!
Benefits
• Your data is not directly in your hands, but in the hands of a third party.
• Total Dependence on the Internet Connection.
• If your cloud Host disappears,
where does your information go?
• Trust, Privacy and Availability
• Performance, Ownership & Cost Savings
• Creation and adoption of new software development processes and training
• Security, Legal and Regulatory issues
