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Minggu, 04 Desember 2016

What is a Private Cloud?

What is a Private Cloud? - A private cloud is a physical cloud infrastructure that is wholly dedicated to one organisation. Virtual machines can be created on that infrastructure for the exclusive use of that entity. This means that when your company invests in private cloud, you are obtaining access to your own host hardware, hypervisor, RAM, storage and networking - none of which is shared with any other user.

The private cloud delivers all the agility, scalability and efficiency of the public cloud, but in addition provides greater levels of control and security, making it ideal for larger businesses or those with strict data, regulation and governance obligations.  Another key benefit of private cloud is the ability to customise the compute, storage and networking components to best suit your specific IT requirements, something that cannot be achieved so easily in the public cloud environment.

A private cloud hosting solution, also known as an internal or enterprise cloud, resides on company’s intranet or hosted data center where all of your data is protected behind a firewall. This can be a great option for companies who already have expensive data centers because they can use their current infrastructure. However, the main drawback people see with a private cloud is that all management, maintenance and updating of data centers is the responsibility of the company. Over time, it’s expected that your servers will need to be replaced, which can get very expensive. On the other hand, private clouds offer an increased level of security and they share very few, if any, resources with other organizations.
 
The technical mechanisms used to provide the different services which can be classed as being private cloud services can vary considerably and so it is hard to define what constitutes a private cloud from a technical aspect. Instead such services are usually categorised by the features that they offer to their client. Traits that characterise private clouds include the ring fencing of a cloud for the sole use of one organisation and higher levels of network security. They can be defined in contrast to a public cloud which has multiple clients accessing virtualised services which all draw their resource from the same pool of servers across public networks. Private cloud services draw their resource from a dsitinct pool of physical computers but these may be hosted internally or externally and may be accessed across private leased lines or secure encrypted connections via public networks.

The additional security offered by the ring fenced cloud model is ideal for any organisation, including enterprise, that needs to store and process private data or carry out sensitive tasks. For example, a private cloud service could be utilised by a financial company that is required by regulation to store sensitive data internally and who will still want to benefit from some of the advantages of cloud computing within their business infrastructure, such as on demand resource allocation.

Many public cloud providers have labeled clouds with the private moniker to avoid confusion about the shared nature of the resources. In those cases, the public cloud is isolated on the physical server and logical networking layer. Examples of such public clouds that have adopted the private cloud name include AWS Virtual Private Cloud.

Before 2015, most private cloud efforts have been exclusively focused on private IaaS. According to Gartner’s Thomas Bittman1, 95% of Private Clouds have failed to live up to the original promise. Gartner’s suggestion for organizations in 2015 is to start looking at private PaaS. According to Gartner for Technical Professionals’ 2015 Planning Guide for Cloud Computing2, “Private PaaS (Enterprise PaaS) improves developer productivity, reduces operational effort, and increases hosting density. This value proposition is too compelling for large enterprises to ignore.”

The term private cloud may lead some to think that a business has to own their private cloud infrastructure outright, building it up in their own offices or data centre suites. While this is perfectly possible and may be appropriate in some cases, it is also possible to place your private cloud requirement with a third party service provider. Doing so typically enables you to derive economic benefits from their existing presence in the data centre environment, including advantageous access to power and internet connectivity along with protection from fire, theft and malicious damage.

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