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	Breve explicación del sistema PVFS, en qué consiste y sus características.
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	  PVMS intenta proveer de un sistema de archivos en red distribuído de alta eficiencia y escalable,
	  normalmente utilizado en entornos de clustering. PVFS es un proyecto de Software Libre que no requiere
	  hardware especial o modificiciones en el núcleo para que funcione. Las características de este
	  sistema de archivos distribuído son:
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{1}}
	  PVFS provee un mismo espacio de nombre para todo el cluster y es accesible por las utilidades habituales.
	  PVFS se monta en todos los nodos y en el mismo directorio simultáneamente, permitiendo el acceso
	  simultáneo a todos los ficheros del sistema PVFS, a través del mismo esquema de directorios. Una vez
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	  Para conseguir un alto rendimiento en el acceso a los datos concurrentemente, PVFS distribuye los datos
	  en múltiples nodos del cluster, denominados \Node%
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{34}}\Seq%
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{italic}}I/O nodes\endSeq{}\endNode{}. Distribuyendo los datos
	  en múltiples nodos, los clientes poseen diferentes rutas hacia los datos, eliminado de esta forma los
	  cuellos de botella (bottlenecks) y mejorando o aumentando el ancho de banda para múltimples clientes.
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	  PVFS permite prescindir de las llamadas al kernel en los accesos al sistema de archivos, gracias al uso
	  de una API nativa. Esta implementa un subconjunto de operaciones UNIX que permiten contactar directamente
	  con los servidores PVFS.
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{1}}Vista del sistema PVFS\endPar{}\endNode{}\endNode{}\endSeq{}\endPar{}\endNode{}\endDisplayGroup{}\endNode{}\Node%
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{1}}
	  La imagen superior muestra como se asignan los nodos para el uso de PVFS. Estos son divididos en
	  nodos de computación (compute nodes) donde se ejecutan las aplicaciones, y los nodos de gestión que
	  manejan las operaciones con los metadatos y los nodos de entrada/salida (I/O) que almacenan la información.
	  Los nodos de administración y entrada/salida también pueden ser utilizados como nodos de computación.
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{1}}2. \Node%
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{title-sosofo-mode}}Componentes PVFS\endNode{}\endPar{}\endSeq{}\Node%
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			Hay cuatro grandes componentes, que son:
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{56}\def\ProcessingMode%
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{}API nativa de PVFS (libpvfs)\endSeq{}\endNode{}\endPar{}\endDisplayGroup{}\endNode{}\Node%
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{57}}\DisplayGroup%
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{}Soporte en el kernel de PVFS\endSeq{}\endNode{}\endPar{}\endDisplayGroup{}\endNode{}\endDisplayGroup{}\endNode{}\Node%
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		 	Los dos primeros componentes son demonios que se ejecutan en los nodos del cluster. El
			servidor de metadatos (mgr) gestiona los metadatos de todos los ficheros. El uso de los
			demonios que operan automáticamente con los metadatos, eliminan algunas de las deficiencias
			de otras soluciones de almacenamiento en red, las cuales tienen que implementar complejos
			esquemas para asegurar la consistencia en los metadatos.
		\endPar{}\endNode{}\Node%
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		 	El segundo demonio es el servidor de E/S (I/O) (iod). Este gestiona el almacenamiento
			y recuperación de los datos almacenados en el disco local del nodo. Estos servidores
			crean los ficheros en el sistema de archivos existente en el disco local del nodo, utilizando
			las llamadas \Node%
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			Esto significa que puedes utilizar cualquier sistema de archivos local para almacenar los
			datos: ext2, ext3, reiserfs, RAID. 
		\endPar{}\endNode{}\Node%
{\def\Element%
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{\def\StartIndent%
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{64}}\Node%
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{center}\def\IsDisplay%
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{false}\def\ScaleX%
{1}\def\ScaleY%
{1}\def\EntitySystemId%
{./imagenes/desc-flow-meta-1.eps}\def\NotationSystemId%
{EPS}}\endNode{}\endNode{}\Node%
{\def\Element%
{70}}\Node%
{\def\Element%
{71}}\Par%
{\def\FirstLineStartIndent%
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{20\p@}\def\sbMin%
{20\p@}\def\sbMax%
{20\p@}\def\sbConditional%
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{1}}Acceso a metadatos\endPar{}\endNode{}\endNode{}\endSeq{}\endPar{}\endNode{}\endDisplayGroup{}\endNode{}\Node%
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{1}\def\saNom%
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{10\p@}\def\saMax%
{10\p@}\def\saConditional%
{1}}\Node%
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{}\Seq%
{}\Node%
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{74}}\Node%
{\def\Element%
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{false}\def\ScaleX%
{1}\def\ScaleY%
{1}\def\EntitySystemId%
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{EPS}}\endNode{}\endNode{}\Node%
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{80}}\Node%
{\def\Element%
{81}}\Par%
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{20\p@}\def\sbMin%
{20\p@}\def\sbMax%
{20\p@}\def\sbConditional%
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{1.25\p@}\def\saMax%
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{1}}Acceso a datos\endPar{}\endNode{}\endNode{}\endSeq{}\endPar{}\endNode{}\endDisplayGroup{}\endNode{}\Node%
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{82}}\Par%
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{1}\def\saNom%
{1.25\p@}\def\saMin%
{1.25\p@}\def\saMax%
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{1}}
		 	La API nativa de PVFS proporciona acceso en espacio de usuario a los servidores PVFS. Esta librería
			maneja las operaciones necesarias para mover datos entre los buffers de usuario y los servidores
			PVFS, manteniendo las operaciones transparentes al usuario. Los gráficos anteriores muestran
			el flujo de datos en el sistema PVFS para las operaciones con metadatos (arriba) y
			el acceso a los datos (abajo). Para las operaciones con metadatos, las aplicaciones
			se comunican mediante la librería con el servidor de metadatos. Cuando se accede a los datos,
			el servidor de metadatos se elimina de la ruta de acceso y se contacta con los servidores
			de E/S.
		\endPar{}\endNode{}\Node%
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{83}}\Par%
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{1}\def\saNom%
{1.25\p@}\def\saMin%
{1.25\p@}\def\saMax%
{1.25\p@}\def\saConditional%
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		 	Finalmente, el soporte PVFS para el kernel Linux provee la funcionalidad para montar sistemas
			PVFS en los nodos Linux. Esto permite a los programas existentes acceder a los datos almacenados
			en PVFS sin modificaciones. 
		\endPar{}\endNode{}\Node%
{\def\Element%
{84}}\DisplayGroup%
{\def\StartIndent%
{0\p@}\def\StartIndentFactor%
{0}\def\sbNom%
{10\p@}\def\sbMin%
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{1}\def\saNom%
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{10\p@}\def\saConditional%
{1}}\Node%
{\def\Element%
{85}}\Par%
{}\Seq%
{}\Node%
{\def\Element%
{86}}\Node%
{\def\Element%
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{\def\DisplayAlignment%
{center}\def\IsDisplay%
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{false}\def\ScaleX%
{1}\def\ScaleY%
{1}\def\EntitySystemId%
{./imagenes/desc-kernel-path-1.eps}\def\NotationSystemId%
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{\def\Element%
{92}}\Node%
{\def\Element%
{93}}\Par%
{\def\FirstLineStartIndent%
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{20\p@}\def\sbMin%
{20\p@}\def\sbMax%
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{1}\def\saNom%
{1.25\p@}\def\saMin%
{1.25\p@}\def\saMax%
{1.25\p@}\def\saConditional%
{1}}Flujo de datos a través del Kernel\endPar{}\endNode{}\endNode{}\endSeq{}\endPar{}\endNode{}\endDisplayGroup{}\endNode{}\Node%
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{94}}\Par%
{\def\FirstLineStartIndent%
{0\p@}\def\FirstLineStartIndentFactor%
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{20\p@}\def\sbMin%
{20\p@}\def\sbMax%
{20\p@}\def\sbConditional%
{1}\def\saNom%
{1.25\p@}\def\saMin%
{1.25\p@}\def\saMax%
{1.25\p@}\def\saConditional%
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		 	La figura anterior muestra el flujo de datos a través del kernel, cuando el soporte del núcleo
			está activo.
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{\def\Label%
{interfazaplicacion}}\DisplayGroup%
{\def\StartIndent%
{0\p@}\def\StartIndentFactor%
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{10\p@}\def\sbMin%
{10\p@}\def\sbMax%
{10\p@}\def\sbConditional%
{1}\def\saNom%
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{10\p@}\def\saMax%
{10\p@}\def\saConditional%
{1}}\Seq%
{}\Seq%
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{bold}\def\fPosture%
{upright}\def\fSize%
{17.28\p@}\def\LineSpacing%
{22.464\p@}\def\LineSpacingFactor%
{0}\def\StartIndent%
{0\p@}\def\StartIndentFactor%
{0}\def\FirstLineStartIndent%
{0\p@}\def\FirstLineStartIndentFactor%
{0}\def\Quadding%
{start}\def\HeadingLevel%
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{1}}3. \Node%
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{96}\def\ProcessingMode%
{title-sosofo-mode}}Interfaces de aplicacion\endNode{}\endPar{}\endSeq{}\Node%
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{97}}\Par%
{\def\FirstLineStartIndent%
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			Para que cualquier sistema pueda utilizar PVFS, existen distintas interfaces de acceso. Estas
			son:
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{\def\StartIndent%
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{5\p@}\def\sbMax%
{5\p@}\def\sbConditional%
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{\def\fSize%
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{100}\def\ProcessingMode%
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{}API nativa de PVFS\endSeq{}\endNode{}\endPar{}\endDisplayGroup{}\endNode{}\Node%
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{101}}\DisplayGroup%
{\def\StartIndent%
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{5\p@}\def\sbMin%
{5\p@}\def\sbMax%
{5\p@}\def\sbConditional%
{1}}\Seq%
{}\LineField%
{\def\fSize%
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{0\p@}\def\PositionPointShiftFactor%
{0}\def\FieldWidth%
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{\def\Element%
{102}\def\ProcessingMode%
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{}Interfaz para el núcleo Linux\endSeq{}\endNode{}\endPar{}\endDisplayGroup{}\endNode{}\Node%
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{103}}\DisplayGroup%
{\def\StartIndent%
{10\p@}\def\StartIndentFactor%
{0}}\Par%
{\def\FirstLineStartIndent%
{-10\p@}\def\FirstLineStartIndentFactor%
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{medium}\def\fSize%
{10\p@}\def\sbNom%
{5\p@}\def\sbMin%
{5\p@}\def\sbMax%
{5\p@}\def\sbConditional%
{1}}\Seq%
{}\LineField%
{\def\fSize%
{8\p@}\def\PositionPointShift%
{0\p@}\def\PositionPointShiftFactor%
{0}\def\FieldWidth%
{10\p@}\def\FieldWidthFactor%
{0}}\Character{8226}\endLineField{}\endSeq{}\Node%
{\def\Element%
{104}\def\ProcessingMode%
{listitem-content-mode}}\Seq%
{}Interfaz ROMIO MPI-\/IO\endSeq{}\endNode{}\endPar{}\endDisplayGroup{}\endNode{}\endDisplayGroup{}\endNode{}\Node%
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{105}}\Par%
{\def\FirstLineStartIndent%
{0\p@}\def\FirstLineStartIndentFactor%
{0}\def\Quadding%
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{ES}\def\sbNom%
{20\p@}\def\sbMin%
{20\p@}\def\sbMax%
{20\p@}\def\sbConditional%
{1}\def\saNom%
{1.25\p@}\def\saMin%
{1.25\p@}\def\saMax%
{1.25\p@}\def\saConditional%
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		 	La API nativa de PVFS provee una interfaz similar a UNIX para el acceso a los archivos
			almacenados en PVFS.
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{106}}\Par%
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{1.25\p@}\def\saMin%
{1.25\p@}\def\saMax%
{1.25\p@}\def\saConditional%
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		 	La interfaz para el núcleo Linux permite a las aplicaciones acceder a los datos de la forma
			tradicional.
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		 	ROMIO implementó las llamadas MPI2 I/O en una librería portable. Esto permite a los
			programadores de aplicaciones paralelas que utilizan MPI, el acceso a los datos de PVFS
			gracias a la interface MPI-\/IO.
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{1}}4. \Node%
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{title-sosofo-mode}}Licencia de este documento\endNode{}\endPar{}\endSeq{}\Node%
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		Se otorga permiso para copiar, distribuir y/o modificar este documento bajo los términos de la
		Licencia de Documentación Libre \Node%
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{}GNU\endSeq{}\endNode{}, versión 1.1 o cualquier versión
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