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The goal of this project is to provide a system for storing and retrieving huge amounts of data, distributed among a large number of heterogenous server nodes, under a single virtual filesystem tree with a variety of standard access methods. Depending on the Persistency Model, dCache provides methods for exchanging data with backend (tertiary) Storage Systems as well as space management, pool attraction, dataset replication, hot spot determination and recovery from disk or node failures. Connected to a tertiary storage system, the cache simulates unlimited direct access storage space. Data exchanges to and from the underlying HSM are performed automatically and invisibly to the user. Filesystem namespace operations may be performed through a standard nfs(2) interface. more ...

News dCache 1.9 now available in production. The Release Policy The 1.9.0 releases are bug fix releases compared to the 1.8 series. The upcoming 1.9.(1,2,3) are feature releases. 1.9 is optionally providing the Chimera filesystem. Please read the installation instructions for details. Workshops and tutorials : dCache HGF/DGI II workshop in Karlsruhe 6/7 Nov 2008 Micro dCache tutorial during the Nov. pre-GDB Nov 11. (including recommendations for Tier I/II to satisfy LHC experiment requirements) LHC Tier I dCache meeting planned for Jan 2009. German support dCache workshop in Aachen : Likely April 6/7 2009. In addition to the Book, we now offer a wiki were you may find some more helpful information. Check the link to findout on how you can contribute with advise, documentation or tools.

Release Policy Release Policy Version 1.9 is our current production version, featuring SRM 2.2, chimera and brandnew pool code. Please checkout our Download Area. Version 1.8 is depricated and will only be patched in individual cases, though supported for a little while.

Most Recent Events

• 28/29 April : HGF Allianz/SuGI dCache SRM/Spaces 'Hands On' installation tutorial in Cologne.
• 24/25 January : HGF Allianz dCache 'Hands On' installation tutorial at DESY.

Information, Contact, Mailing lists

Documentation : Publications, Presentations and more

dCache, the Book

More on mailing lists
Contact :
More : The dCache wiki

Project Partners

dCache is a joint venture between the Deutsches Elektronen-Synchrotron, DESY and the Fermi National Accelerator Laboratory, FNAL.
Since Jan 2007, NDGF is contributing significantly to this project.

Project Status

Since end of 2001 our full production release is in use at an increasing number of sites world-wide and is delivering tera bytes of data from over hundreds of distributed server nodes.

Work in progress

• Chimera : improved file system engine.
• VOMS integration (Extended Proxies, VO's Roles, gPlazma)
• SRM Space Management and "Spaces".
• VO and Group Quotas.
• Improved and simplified Installation.
• Centrallized HSM Flush Management.

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