A key feature of a cloud environment is that it provides a platform that’s designed to be elastic
(you can use just the resources you want when you need them),
so the users/customers provision resources, such as computing or storage resources, that they pay for on a per-unit basis. When the user no longer needs that resource and stops paying, the resource is released back into the pool of resources.
This helps organizations avoid the cost of idle computing resources.
Instead of purchasing, managing, and maintaining a server environment.
for example, a business can purchase computing on demand, avoiding capital expenditures.
The term self-service is important here too.
With self-service, the developer of an application, for example, is able to use a browser or portal interface to acquire appropriate resources needed to build or operate an application.
This just-in-time model is a more efficient way to ensure that the IT organization can be responsive to business change.
Workload management
The cloud is a federated (distributed) environment that pools resources so they can work together.
Making this happen requires that these resources be optimized to work as though they were an integrated well-tuned environment comprised of a variety of workloads.
A workload is an independent service or collection of code that can be executed.
It’s important in the cloud that workloads be designed to support the right task with the right cloud services.
For example, some workloads need to be placed in a private cloud because they require fast
transaction management and a high level of security.
Other workloads may not be so mission critical and can be placed in a public cloud.
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