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Revision as of 04:12, 15 September 2009

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Ceph
File:Ceph logo.jpg
Developer(s)Storage Systems Research Center at the University of California, Santa Cruz
Stable release0.14 / September 8, 2009 (2009-09-08)
Repository
Operating systemLinux
TypeDistributed file system
LicenseLGPL
Websiteceph.newdream.net


Ceph is also the abbreviation for the orchid genus Cephalanthera.

Ceph is a free software distributed file system created by researchers at the Storage Systems Research Center in the Jack Baskin School of Engineering at the University of California, Santa Cruz. The main developer is Sage Weil (developer of the Webring concept and founder of Dreamhost), who implemented much of the Ceph code for his doctoral dissertation based both on earlier SSRC research and his own research.

Ceph's main goals are to be POSIX-compatible, and completely distributed without a single point of failure. The data is seamlessly replicated making it fault tolerant.

As of November 2007, Ceph is considered to be in an "early alpha stage" and is not yet ready for production.

The clients mount the file system using a Linux kernel client. An older FUSE-based client is also available. The servers run as regular Unix daemons.

Design

Ceph employs three distinct kinds of daemons:

  • Cluster monitors, which keep track of active and failed cluster nodes.
  • Metadata servers (MDS) which store the metadata of inodes and directories.
  • Object storage devices (OSDs) which actually stores the content of files. OSDs usually store data on raw block devices, using a custom storage format called EBOFS. Alternatively, a local disk file system can be used with some caveats.

All of these are fully distributed, and may run on the same set of servers. Clients directly interact with all of them.

Unlike most distributed file systems, Ceph does striping of individual files across multiple nodes to achieve higher throughput, similarly to how RAID0 stripes partitions across multiple hard drives. A planned extension to this feature is adaptive load balancing, whereby frequently accessed objects are replicated over more nodes.

References

  1. ^ Storage Systems Research Center (2008-05-20). "Petabyte Scale Object-Based Storage Systems @ SSRC". {{cite web}}: Check date values in: |date= (help)
  2. ^ Jeremy Andrews (2007-11-15). "Ceph Distributed Network File System". KernelTrap. {{cite web}}: Check date values in: |date= (help)
  3. ^ Jake Edge (2007-11-14). "The Ceph filesystem". LWN.net. {{cite web}}: Check date values in: |date= (help)

See also

External links


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