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[转载]Cloud Computing Explained

已有 2692 次阅读 2010-5-9 21:33 |个人分类:cloud|系统分类:科研笔记|关键词:cloud| Cloud |文章来源:转载


Cloud Computing refers to shared computing resources accessed remotely as services (via the Internet, Intranet, dedicated network etc), that can be provisioned “on demand” and billed according to usage.  Most current Cloud Service providers (such as Amazon and Google) primarily gear their services at SMEs. However, many larger Enterprises are now beginning to think of:

a) how they can implement Cloud Computing internally - Cloud Private
b) how they can extend their Cloud Private to make use of available Cloud services from external vendors - Hybrid Cloud
c) or how they can offer their own Cloud services - Cloud Public

The term “Cloud”  refers to on-demand services accessed over the Internet, however these services can be classified into 3 layers, each layer defining a  “Cloud of services” on its own”:

1. The “Infrastructure” Cloud provides on-demand access to server capacity, storage space, network connection and middleware software, with flexibility to increase or decrease capacity as required

2. “IT Services" or the “Service” Cloud provides a set of software components from which the Independent Software Vendors (ISVs) can create end-user applications. These components are generally exposed as web services.

3. Software-as-a-Service or the “Application Cloud” is a software application that is licensed for use as a service provided to customers on demand




Usually, the term “Cloud Computing” refers to the “Infrastructure” Cloud. This set of Cloud services includes on demand access to server, storage, network services as well as the ability to design and deploy complex IT configuration which supports the business applications. “Platform- as-a-Service” is another service within Cloud Computing which offers developers a full suite of tools to design their applications without struggling with deployment details.

When companies are considering whether or not to build a Cloud Private  (also called “Internal Cloud”), it refers to a Cloud Computing platform.

What has Virtualisation got to do with Cloud Computing?

Cloud Computing relies on Virtualisation. However it requires an additional layer of automation and intelligence to deliver the on demand services. Virtualisation is the enabling technology whilst a Cloud Computing platform provides the level of automation and autonomics required to offer a zero touch self service Data Centre to its users.


Public Cloud, Private Cloud and Cloud Hybrid

Cloud Computing Principles: "Shared computing resources, virtualised and accessed as a service"

Public Cloud

  • Open market for on demand computing and IT resources
    • Amazon, Google, IBM...
    • Huge adoption by SMEs and currently tested by Enterprise
  • However
    • Maturing and Limited SLA
    • Reliability and availability to be improved
    • Security to be demonstrated
    • Trust and confidence to be acquired
  • Corporates and large Enterprises have existing Data Centres running their mission critical applications
  • Large Enterprises are not likely to move their core or strategic applications onto Public Cloud in the short to medium time frame

Private Cloud

  • For Enterprises and Corporates with large scale IT
  • For their core and strategic applications
  • To take Cloud Computing benefits
    • Data Centre consolidation and reduction of Capex
    • Opex reduction by automation
    • Flexibility, cycle time improvement and internal quality of service

Cloud Hybrid

  • Enterprises will continue to test and adopt Public Cloud
  • Overflow management and peak adaptation via Public Cloud
  • Hybrid Cloud = Private Cloud with connections to Public Cloud

 

Cloud Private - internal and secure for your Enterprise.

The Benefits of Cloud Private

Cloud Private enables a more dynamic and cost effective use of IT infrastructure and resources.  The top line benefits to your organisation include:

•    Reduced Capital investment
•    On demand scalability – scale up when you need it, scale back in a downturn
•    Get processes right first time around
•    Reduce business process cycles
•    Location independence for customers and Data Centre assets
•    Lower price point for hardware/software usage – “Pay as You Go” (PAYG) model
•    Increased Enterprise agility
•    Usage billing (PAYG model in IT Units)
•    Automated provisioning



Reference:
cloud essential: http://www.cloudessential.com/cloudcomputing/
Cloud Computing Explained.pdf

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