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Encyclopedia > Intermezzo

InterMezzo is a distributed file system written for Linux, distributed with a GPL licence. The kernel component has been included in the standard Linux kernel since kernel version 2.4.15. InterMezzo is designed to work on top of an existing journaling file system such as ext3, JFS, ReiserFS and XFS. A distributed file system is a file system that supports sharing of files and resources in the form of persisent storage over a network. ... Tux, a cartoon penguin frequently featured sitting, is the official Linux mascot. ... The GNU logo For other uses of GPL, see GPL (disambiguation). ... In computer science, the kernel is the fundamental part of an operating system. ... A journaling file system is a file system that logs changes to a journal (usually a circular log in a specially-allocated area) before actually writing them to the main file system. ... The ext3 or third extended filesystem is a journalled file system that is coming into increasing use among users of the Linux operating system. ... JFS is a journaling filesystem created by IBM. It is available under an open source license. ... The ReiserFS is a general-purpose computer file system designed and implemented by a team at Namesys led by Hans Reiser, who is referred to as the projects Benevolent Dictator for Life. ... XFS is a high-performance journaling file system created by SGI (Silicon Graphics Inc. ...


An InterMezzo system consists of a server, which holds the master copy of the file system, and one or more clients with a cache of the file system. It works either in a replication mode, in which a client maintains a duplicate of the entire file system, or in an on-demand mode in which the client only requests files that it needs. It does this by capturing all writes to the server's file system journal streaming them to the client systems to be replayed.


It is described as a "high availability file system" since a client can continue to operate even if the connection to the server is lost. During a period of disconnection, updates are logged and will be propagated when the connection is restored. Conflicts are detected and handled according to a "conflict resolution policy" (although the best policy is likely to be to avoid conflicts).


Typical applications of replication mode would be:

  • A cluster of servers operating on a shared file system.
  • Computers that are not always connected to the network, such as laptops.

Typical applications of on-demand mode would be:

  • Distributed file serving, e.g., FTP or WWW servers could be mirrored in a remote location without needing to propagate files that are never accessed.
  • Desktop workstations.

InterMezzo was started as part of the Coda file system project at Carnegie Mellon University and takes many design decisions from Coda. Intermezzo was designed for enhanced scalability, performance, modularity, and easy integration with existing file systems. This page is about the File Transfer Protocol, a computer protocol. ... Graphic representation of the world wide web around Wikipedia The World Wide Web (WWW, or simply Web) is an information space in which the items of interest, referred to as resources, are identified by global identifiers called Uniform Resource Identifiers (URI). ... Coda is a distributed filesystem, developed at Carnegie Mellon University since 1987, under the direction of Mahadev Satyanarayanan. ... Carnegie Mellon University Carnegie Mellon University is a private research university located in Pittsburgh, Pennsylvania. ...


Although InterMezzo was supported in the standard Linux kernel in version 2.4, it has been removed in the 2.6 series. InterMezzo is apparently no longer under development, and its developers have moved on to a new project named Lustre. Lustre is an Open Source file system for Network-attached storage, generally used for large scale cluster computing. ...


External links

  • InterMezzo project homepage
  • Using the InterMezzo Distributed Filesystem, Bill von Hagen, LinuxPlanet, August 12, 2002.
  • Debian Bug report logs on InterMezzo, mentioning Lustre.

  Results from FactBites:
 
Intermezzo - Wikipedia, the free encyclopedia (502 words)
The intermezzo, in the 18th century, was a comic operatic interlude inserted between acts or scenes of an opera seria.
In the 19th century the intermezzo acquired another meaning: an instrumental piece which was either a movement between two others in a larger work, or a character piece which could stand on its own.
In this sense an intermezzo is similar to the entr'acte.
  More results at FactBites »

 
 

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