What is cloud computing?
The cloud is not really a technology by itself. Rather, it is an approach to building IT services that harness the rapidly increasing horsepower of servers as well as virtualization technologies that combine many servers into large computing pools and divide single servers into multiple virtual machines that can be spun up and powered down at will.
What is a public cloud?
Naturally, a public cloud is a service that anyone can tap into with a network connection and a credit card. "Public clouds are shared infrastructures with pay-as-you-go economics," explains Forrester analyst James Staten in an April report. "Public clouds are easily accessible, multitenant virtualized infrastructures that are managed via a self-service portal."
What is a private cloud?
Like public clouds, delivery of private cloud services would typically be done through a Web interface with self-service and chargeback attributes. "Private clouds give you many of the benefits of cloud computing, but it's privately owned and managed, the access may be limited to your own enterprise or a section of your value chain," Kloeckner says. "It does drive efficiency, it does force standardization and best practices."
Can applications move from one cloud to another?
es, but that doesn't mean it will be easy. Services have popped up to move applications from one cloud platform to another (such as from Amazon to GoGrid) and from internal data centers to the cloud. But going forward, cloud vendors will have to adopt standards-based technologies in order to ensure true interoperability, according to several industry groups. The recently released "Open Cloud Manifesto" supports interoperability of data and applications, while the Open Cloud Consortium is promoting open frameworks that will let clouds operated by different entities work seamlessly together. The goal is to move applications from one cloud to another without having to rewrite them.
What is required to support a cloud service?
The significant value of cloud-based solutions is the speed in which they can be deployed, implemented and operating as-designed with little resources required by the client, says Mark Sargent, director of solutions engineering for Telogis. “As cloud solutions are generally hosted off-site, the technology requirements are typically as simple as a common web browser and Internet connection. There are no server and infrastructure requirements and no additional IT workload to administer and support a cloud solution.”
How is my data backed up?
Many cloud-based hosting services provide redundancy, data backup and data recovery services, says Dexter + Chaney. Data backup is another function of security measures as well, and ideally should be backed up in multiple physical locations