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Scalability Vs Elasticity

SCALABILITY - ability of a system to increase the workload on its current hardware resources (scale up);
ELASTICITY - ability of a system to increase the workload on its current and additional (dynamically added on demand) hardware resources (scale out);

Scalability: "Increasing" the capacity to meet the "increasing" workload.
Elasticity: "Increasing or reducing" the capacity to meet the "increasing or reducing" workload.
Scalability: In a scaling environment, the available resources may exceed to meet the "future demands".
Elasticity: In the elastic environment, the available resources match the "current demands" as closely as possible.
Scalability: Scalability adapts only to the "workload increase" by "provisioning" the resources in an "incremental" manner.
Elasticity: Elasticity adapts to both the "workload increase" as well as "workload decrease" by "provisioning and deprovisioning" resources in an "autonomic" manner.
Scalability: Increasing workload is served with increasing the power of a single computer resource or with increasing the power by a group of computer resources.
Elasticity: Varying workload is served with dynamic variations in the use of computer resources.
Scalability: Scalability enables a corporate to meet expected demands for services with "long-term, strategic needs".
Elasticity: Elasticity enables a corporate to meet unexpected changes in the demand for services with "short-term, tactical needs".
Scalability: It is "increasing" the capacity to serve an environment where workload is increasing.
This scalability could be "Scaling Up" or "Scaling Out".
(Example:
Scaling Up - increasing the ability of an individual server
Scaling out - increasing the ability by adding multiple servers to the individual server.)
Elasticity: It is the ability to "scale up or scale down" the capacity to serve at will.
Scalability: To use a simile, "scaling up" is an individual increasing her power to meet the increasing demands, and "scaling out" is building a team to meet the increasing demands.
Elasticity: To use a simile, a film actor increasing or reducing her body weight to meet differing needs of the film industry.

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