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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.
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SCALABILITY - the ability of a system to increase the workload on its current hardware resources (scale-up);
ELASTICITY - the ability of a system to increase the workload on its current and additional (dynamically added on demand) hardware resources (scale-out);
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Scalability means the ability of a system to increase the load of the work on its present hardware resource and Elasticity means the ability of a system to increase the work on both the present and additional hardware resource
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Scalability is defined as an ability of the system to increase workload on system and still system performance doesn't affects.
Elasticity is defined as to increase the workload on its current and additional hardware resources.
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It’s very confusing question for beginner thanks for asking this question , I will try to define both in very simple way.
Cloud scalability :
It is ability by which we can change the size or counts of application or instances.
for example : you have 2 VMs running for web-server but this two are not sufficient to carry the load . in this point you need to scale your VM (virtual machine). after scaling up you will have 3 VMs for web-server to manage load.
In similar fashion according to vice-versa situation if you don’t have that much of load on web-server then you can scale down 1 VM as before.
Cloud elasticity :
Elasticity is the ability to grow or shrink infrastructure resources dynamically as needed to adapt to workload changes in an autonomic manner, maximizing the use of resources.
Regards,
Diana
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Scalability is used to refer to static fluctuations in demands and supply.
Flexibility is used to refer to dynamic fluctuations in demands and supply.
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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); Elasticity is strongly related to deployed-on-cloud applications.
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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); Elasticity is strongly related to deployed-on-cloud applications.