dCache.Org eagle
black_bg
home | documentation | downloads | feedback | search | imprint
black_bg



Scope of the project

dCache in EMI

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. Beside HEP specific protocols, data in dCache can be accessed via NFSv4.1 (pNFS) as well as through WebDav.
more ...

Click the image to watch the movie.


News

  • WLCG Collaboration workshop was organized by dCache.org at DESY in July 11-13, 2011. (Video Recordings)
  • EMI 1 (Kebnekaise) released. Kebnekaise
  • Great success : 5th dCache workshop in Göttingen, 16/17 March, 2011
  • dCache Articles
  • European Middleware Initiative, EMI started May 2010. Factsheet
  • Security
    • dCache.org is introducing a new mailing list :
      security at dcache dot org
      dCache user should report problems or bugs to this list if there is the suspicion that the issue is security related or if the report may contain confidential information. (e.g. passwords). Only a very restricted number of people have access to this particular mailing list.
  • Newletters and announcements.
  • Chimera
    Chimera is the preferred name space abstraction for dCache. It is a thin layer on top of a relation database (preferrably PostgreSQL). In contrast to PNFS it is platform independent, scalable, and fully embedded in dCache. By now, most dCache Tier I sites as well as many Tier II sites have migrated to Chimera. PNFS itself is no longer maintained, although dCache does still support using PNFS as a backend. We recommend all sites to upgrade to Chimera as soon as possible. Please study the migration instructions and give it a try. You can evaluate the entire migration procedure in a safe test environment. More information is available from our documentation area.
  • The dCache wiki : In addition to the Book, we offer a wiki were you may find some more helpful information. Check the link to findout on how you can contribute to the wiki with advise, documentation or tools.

Releases

Release Policy

The dCache project uses timeboxing to manage the release process. A new feature release is made every three months. These are maintained for four months during which bug fix releases are made. Once a year on April 1st a long term support release is made - we call these golden releases. These are maintained for at least two years.

Golden Releases

Golden release 1.9.5 will be supported until the end of the technical LHC break beginning of 2012. The next Golden Release (1.9.12) is out and will be supported for an extended period.


Current and Future Releases
  • 2.1 will be released primo January 2012
    The following list of features is subject to change.
    • Kerberos for NFS4
    • ACL manipulation through NFS4
    • More memory efficient directory cache for NFS
    • Support export file for NFS
    • NFS4 referals
    • Color highlighting in admin service
    • Tab completion in admin service
    • ssh2 support in admin service
    • Plugin support
    • Configurable billing format
    • Limited NIS plugin for gPlazma 2
    • Feature parity between webadmin and legacy monitoring service
  • 2.0 is out
    Fomerly known as version 1.9.14. Despite the version number increase, the number of changes are not bigger than between usual feature releases. The version number is increased because of changes in the version number format.
    • HTTP Basic Authentication for WebDAV.
    • Reduced latency for server side srmCopy.
    • ACL admin service integrated into pnfs manager.
    • Wildcards in pool manager commands.
    • SRM client's overwrite request can be honored without having to enable overwrite in other doors.
    • Pool to pool transfers use HTTP rather than DCAP.
    • Pluggable pool selection algorithm and a new write pool selection algorithm.
    • Lots of work on the webadmin component.
  • 1.9.12 Golden Release II
    • Supported until April 2013.
    • The ultimate dCache Golden Release upgrade guide by Gerd (NDGF).
    • GLUE 2 support.
    • New pin manager.
    • HTTP support for third party srmCopy transfers.
    • Proxy certificate and VOMS support in the HTTP/WebDAV door.
    • Reduced file open latency.
    • gPlazma 2 with ARGUS black listing.
  • 1.9.6 to 1.9.11 and 1.9.13 are deprecated.
  • 1.9.5 Golden Release will be supported until the end of the technical break primo 2012.
  • 1.9.4 and below are deprecated.

Funding

Information, Contact, Mailing lists

Documentation : Publications, Presentations and more

dCache, the Book

More on mailing lists
Contact : or
More : The dCache wiki

Project Partners

dCache is a joint venture between the Deutsches Elektronen-Synchrotron, DESY, the Fermi National Accelerator Laboratory, FNAL and the Nordic Data Grid Facility, NDGF.

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.
black_bg
Copyright dCache.org © 2003 - 2012