The DCE Distributed File System (DCE/DFS) is the remote file access protocol used with the Distributed Computing Environment. It was based on the AFS Version 3.0 protocol that was developed commercially by Transarc Corporation. AFS Version 3.0 was in turn based on the Andrew File System Version 2.0 protocol (also used by the Coda disconnected file system) originally developed at Carnegie Mellon University.

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  • The DCE Distributed File System (DCE/DFS) is the remote file access protocol used with the Distributed Computing Environment. It was based on the AFS Version 3.0 protocol that was developed commercially by Transarc Corporation. AFS Version 3.0 was in turn based on the Andrew File System Version 2.0 protocol (also used by the Coda disconnected file system) originally developed at Carnegie Mellon University. DCE/DFS consisted of multiple cooperative components that provided a network file system with strong file system semantics, attempting to mimic the behavior of POSIX local file systems while taking advantage of performance optimizations when possible. A DCE/DFS client system utilized a locally managed cache that would contain copies (or regions) of the original file. The client system would coordinate with a server system where the original copy of the file was stored to ensure that multiple clients accessing the same file would re-fetch a cached copy of the file data when the original file had changed. The advantage of this approach is that it provided very good performance even over slow network connections because most of the file access was actually done to the local cached regions of the file. If the server failed, the client could continue making changes to the file locally, storing it back to the server when it became available again. DCE/DFS also divorced the concept of logical units of management from the underlying volume on which the fileset was stored. In doing this it allowed administrative control of the location for the fileset in a manner that was transparent to the end user. To support this and other advanced DCE/DFS features, a local journaling file system (DCE/LFS also known as Episode) was developed to provide the full range of support options. IBM has not maintained it since 2005: http://www-306. ibm. com/software/stormgmt/dfs/ IBM was working on a replacement for DCE/DFS called ADFS (Advanced Distributed File System). One major goal of this project was to decouple DFS from the complexities of DCE's cell directory services (CDS) and security services (secd). Another key feature would have been the elimination of enctype limitations associated with DCE/RPC. No public mention of this effort has been made since 2005, leading many to believe the project has been killed.
  • DCE Distributed File System o DCE DFS es un protocolo de nivel de aplicación, según el Modelo OSI. Es utilizado para sistemas de archivos distribuido de DCE en un entorno de red de computadoras de área local. Posibilita que distintos sistemas conectados a una misma red accedan a ficheros remotos como si se tratara de locales, permite agrupar archivos repartidos en diferentes máquinas, en un espacio de nombres único.
  • Il DCE Distributed File System (DCE/DFS) è il protocollo dedicato allo scambio remoto di file ed è usato nel Distributed Computing Environment. Originariamente venne sviluppato a partire della terza versione dell'AFS. In DCE/DFS il client gestisce una cache locale che contiene, per intero o in parte, i file di cui ha bisogno. Esso collabora con il server dove è conservata la copia originale del file per garantire la corretta propagazione delle modifiche fatte: nel momento in cui un altro client accede allo stesso file, prima ne scarica una nuova (rispetto alla sua propria cache) copia già aggiornata. Il vantaggio di questo approccio sta nelle prestazioni raggiunte anche su reti con connessione lenta, in quanto la maggior parte degli accessi sono comunque fatti nella copia locale mantenuta dai client. Se il server viene a mancare, il client continua ad operare sulla sua copia del file, per poi notificare le modifiche fatte una volta ristabilita la connessione. In DCE/DFS manca il concetto di unità logica ed il singolo file non è legato al dispositivo che lo ospita: per supportare ciò (e altre caratteristiche avanzate) è stato sviluppato un filesystem journaled locale chiamato DCE/LFS (conosciuto anche come "Episode").
  • DCE Distributed File System（DCE/DFS）は、Distributed Computing Environmentで使われている遠隔ファイルアクセスプロトコルである。トランザークの開発した AFS Version 3.0 に基づいている。AFS Version 3.0 は、カーネギーメロン大学で開発された Andrew File System Version 2.0 プロトコルに基づいて開発された。
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  • The DCE Distributed File System (DCE/DFS) is the remote file access protocol used with the Distributed Computing Environment. It was based on the AFS Version 3.0 protocol that was developed commercially by Transarc Corporation. AFS Version 3.0 was in turn based on the Andrew File System Version 2.0 protocol (also used by the Coda disconnected file system) originally developed at Carnegie Mellon University.
  • DCE Distributed File System o DCE DFS es un protocolo de nivel de aplicación, según el Modelo OSI. Es utilizado para sistemas de archivos distribuido de DCE en un entorno de red de computadoras de área local. Posibilita que distintos sistemas conectados a una misma red accedan a ficheros remotos como si se tratara de locales, permite agrupar archivos repartidos en diferentes máquinas, en un espacio de nombres único.
  • Il DCE Distributed File System (DCE/DFS) è il protocollo dedicato allo scambio remoto di file ed è usato nel Distributed Computing Environment. Originariamente venne sviluppato a partire della terza versione dell'AFS. In DCE/DFS il client gestisce una cache locale che contiene, per intero o in parte, i file di cui ha bisogno.
  • DCE Distributed File System（DCE/DFS）は、Distributed Computing Environmentで使われている遠隔ファイルアクセスプロトコルである。トランザークの開発した AFS Version 3.0 に基づいている。AFS Version 3.0 は、カーネギーメロン大学で開発された Andrew File System Version 2.0 プロトコルに基づいて開発された。
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  • DCE Distributed File System
  • DCE Distributed File System
  • DCE/DFS (file system)
  • DCE Distributed File System
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