Parece que el mercado tiende hacia la extenalización de sus servicios y una de las formas es haciéndolo mediante el Cloud Computing. Dentro de este, y del nivel de externalización que siguen las empresas, se pueden distinguir 3 categorías:
Infrastructure as a Service (Iaas):
En español Infraestructura como Servicio. Modelo de distribución de infraestructura de computación como un servicio, normalmente mediante una plataforma de virtualización. En lugar de adquirir servidores, espacio en un centro de datos o equipamiento de redes, los clientes externalizan todos estos recursos y lo delegan a un proveedor de servicios externo. Una diferencia fundamental con el hosting virtual es que el aprovisionamiento de estos servicios se hacen de manera integral a través de la web.
Casos de uso comunes IaaS: Balanceo de la infraestructura del centro de datos temporalmente en periodos de carga masivos (por ejemplo, más tráfico durante el periodo de Navidad).
Platform as a Service (PaaS)
En español Plataforma como Servicio. Aunque suele identificarse como una evolución de SaaS, es más bien un modelo en el que se ofrece todo lo necesario para soportar el ciclo de vida completo de construcción y puesta en marcha de aplicaciones y servicios web completamente disponibles en Internet. Otra característica importante es que no hay descarga de software que instalar en los equipos de los desarrolladores. PasS ofrece mútliples servicios, pero todos provisionados como una solución integral en la web.
Casos de uso comunes PaaS: Incrementa la productividad del desarrollador y los ratios de la puesta en producción de una aplicación disminuyen (time-to-market).
Software as a Service (SaaS)
En español Software como Servicio. Modelo de distribución de software donde una empresa sirve el mantenimiento, soporte y operación que usará el cliente durante el tiempo que haya contratado el servicio. El cliente usará el sistema alojado por esa empresa, la cual mantendrá la información del cliente en sus sistemas y proveerá los recursos necesarios para explotar esa información. Se elimina, por tanto, la necesidad de instalación y ejecución de aplicaciones en máquinas físicas individuales.
Casos de uso comunes SaaS: Se reemplaza el modelo de software tradicional en el que el cliente tiene su propio dispositvo.
Fuentes:
http://apprenda.com/library/paas/iaas-paas-saas-explained-compared/
http://es.wikipedia.org/wiki/Computaci%C3%B3n_en_la_nube
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