Cloud computing

Posted on 2011-10-17
Last Modified: 2012-05-12
Can you send a detail documentation on Cloud computing
Question by:harishalwala
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    Expert Comment


    The cloud is vast, vague and hazy.
    A detailed documentation of Cloud computing is way beyond a simple question on EE, even for 5,000 points per question.
    I suggest that you take some time and read about Cloud Computing elsewhere - try Wikipedia for a start - and then return here with more specific questions.
    LVL 9

    Assisted Solution

    Cloud computing is the delivery of computing as a service rather than a product, whereby shared resources, software, and information are provided to computers and other devices as a utility (like the electricity grid) over a network (typically the Internet).

    Cloud computing exhibits the following key characteristics:
    Agility improves with users' ability to re-provision technological infrastructure resources.
    Application programming interface (API) accessibility to software that enables machines to interact with cloud software in the same way the user interface facilitates interaction between humans and computers. Cloud computing systems typically use REST-based APIs.
    Cost is claimed to be reduced and in a public cloud delivery model capital expenditure is converted to operational expenditure. This is purported to lower barriers to entry, as infrastructure is typically provided by a third-party and does not need to be purchased for one-time or infrequent intensive computing tasks. Pricing on a utility computing basis is fine-grained with usage-based options and fewer IT skills are required for implementation (in-house).
    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 phone). As infrastructure is off-site (typically provided by a third-party) and accessed via the Internet, users can connect from anywhere.
    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.    
    Reliability is improved if multiple redundant sites are used, which makes well-designed cloud computing suitable for business continuity and disaster recovery.
    Scalability and Elasticity via dynamic ("on-demand") provisioning of resources on a fine-grained, self-service basis near real-time, without users having to engineer for peak loads.
    Performance is monitored, and consistent and loosely coupled architectures are constructed using web services as the system interface.
    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. However, the complexity of security is greatly increased when data is distributed over a wider area or greater number of devices and in multi-tenant systems that are being shared by unrelated users. In addition, user access to security audit logs may be difficult or impossible. Private cloud installations are in part motivated by users' desire to retain control over the infrastructure and avoid losing control of information security.
    Maintenance of cloud computing applications is easier, because they do not need to be installed on each user's computer.
    LVL 6

    Accepted Solution

    What would everyone tell you about Cloud computing is that it's a big big topic and we can talk hours and hours about it... which is true.

    Just be careful that Cloud computing isn't really an invention as such.. nor is it something really new.. it's just the way it is being sold nowadays.

    What you really need to know about Cloud computing:
    1) The whole thing about cloud computing is not about technology.. it's just the way service is being provisioned and priced to the customer (on-demand, immediate, agile).
    2) There are many types of cloud computing offerings.
    3) Not every organisation is ready for cloud computing, and offers really vary in terms of SLA and what's covered and what is not... so you really need to spend the time going through your drives and what your challenges are .. and what you are trying to achieve.
    4) The best thing I would say about CC, is the agility and fast provisionning. Which is really valuable to a lot of businesses.
    5) Cloud computing could be Public/Private or a Hybrid.

    I work on building cloud computing infrastructure, so I'm happy to explain further should you have a specific question about the topic.
    LVL 1

    Expert Comment

    Please let me know your knowledge area as of now and purpose to know about cloud computing.
    As it would be better to share information about cloud which is worthy to you
    LVL 16

    Expert Comment

    by:Kamal Khaleefa

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