More and more companies are looking to defray costs and gain flexibility by leveraging infrastructure that can be used on demand. What does this mean to you?
✓ Think about how you’re getting your services.
✓ Understand which services include a set of well-defined interfaces and which ones will lock you in to a complex set of services that will be difficult to move away from.
✓ Know why you’re using a cloud service. For example, if you need some temporary capacity to test a new application, your requirements will be very different than if you’re creating an application that will operate in a cloud.
In addition to understanding potential cloud gains, get familiar with how your infrastructure service provider handles the following capabilities:
✓ Explicitly defines service level agreements for availability, support, and performance (of provisioning more resource)
✓ A utility computing billing arrangement, relating cost to actual resource usage in a measured way
✓ A virtualization environment that enables the configuration of systems (for compute power, bandwidth, and storage) as well as the creation individual virtual machines (all to be available on an ad-hoc basis)
✓ A flexible, extensible, resource-rich environment that’s engineered for secure multi-tenancy (multiple users or tenants running the software in a shared environment on its servers)
✓ Internet connectivity, including a Web services interface to the customer’s management environment
Source of Information : cloud computing for dummies 2010
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