Difference between revisions of "Cloud Computing"
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Revision as of 18:12, 1 March 2018
Cloud computing refers to a utility-based provisioning of virtualized computa-tional resources over the Internet.
On-Premise Computing:
- Requires hardware, space, electricity, cooling
- Requires managing OS, applications and updates
- Software Licensing
- Difficult to scale:
- Too much or too little capacity
- High upfront capital costs
- You have complete control
Cloud Computing:
- Shared, multi-tenant environment
- Pools of computing resources
- Resources can be requested as required
- Available via the Internet
- Private clouds can be available via private WAN
- Pay as you go
Una de las ventajas más importantes del Cloud es que puede ser «scaled» fácilmente (Resources can be requested as required). En otras palabras, a través del cloud la capacidad se puede variar fácilmente con respecto a la demanda. sólo cuando la demanda sea alta, el sistema será configurado para disponer de gran capacidad. On-Premise Computing, lo que generalmente pasa es que se configura el sistema para cubrir una capacidad promedio y generalmente se debe sobreestimar para que, cuando la demanda sea alta, poder todavía cubrirla. Entonces, cuando la demanda es baja estamos a "over capacity" y podría también pasar que cuando la demanda sea muy alta estemos a "under capacity". Esto es solucionado en el cloud. Esto se puede visualizar a través del ejemplo presentado en las siguientes figuras, en el cual se plantea el caso de un Concert ticket web site.
Infrastructure as a Service (IaaS) - Platform as a Service (PaaS) - Software as a Service (SaaS)
