What is the difference between scalability and elasticity?
Please let me know if anyone knows it in detail the difference b/w scalability and elasticity in the term of cloud web hosting?
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Scalability and elasticity are two of the key features of a good cloud server hosting solution. They may appear to be similar but are quite different in the functions. Scalability means the ability to scale up or draw resources according to the changing demands of a business. They will be able to do it without having to make large and upfront investments in the infrastructure needed to meet the changing needs. Elasticity enables businesses to meet the variability in demand and helps it ride through the peaks and valleys without having to constantly make adjustments in the system.
Often used interchangeably, scalability and elasticity are not quite the same when looking at cloud computing. Both refer to an environment’s adaptability – to be able to expand and contract as required. As workload volumes increase this requires allocating and adding resources, and detaching or reallocating resources as the demand goes down.
Versatility in cloud foundation includes empowering the hypervisor to make virtual machines or holders with the assets to take care of the continuous demand. Adaptability frequently is talked about at the application layer, highlighting ability of a framework, system or procedure to deal with a developing measure of work, or its capability to be amplified keeping in mind the end goal to oblige that development.
There are two sorts of adaptability:
The primary choice is Scale Vertically or Scale-Up – this sort of adaptability can work with any application to a certain point. In a flexible domain, scaling up would be proficient by moving the application to a greater virtual machine or by resizing the VM.
The second choice is Scale Horizontally or Scale-out, by provisioning more examples of the application levels on extra virtual machines and after that isolating the heap between them.
Scalability is the ability of a system to handle the increased load on its current hardware and software resources. In a highly scalable system it is possible to increase the workload without increasing the resource capacity. Scalability supports any sudden surge in the demand/traffic with current set of resources.
Elasticity is the ability of a system to increase the workload by increasing the hardware/software resources dynamically. Highly elastic systems can handle the increased demand and traffic by dynamically commission and decommission resources. Elasticity is an important characteristic of Cloud Computing applications. Elasticity means how well your architecture is adaptable to workload in real time.
Scalability and Elasticity are two different terms in cloud computing. But both are slightly different from each other- In Scalability- Services or requirements are scalable according to user need, it may be less or more like if I am talking about cloud space then some time you need to use 1 GB ram and 200 GB ROM and some some time your requirement is 5 GB ram and 500 GB ROM. So this requirement is scalable. But In Elasticity- Services or requirements are always pramotional to time means may be your services demanded in 2 weeks but after sometime your need on urgent basis and it collapsed with 1 week so in this case the tern elasticity used.
