Scope of the project
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.
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8th International dCache Workshop Hamburg and the dCache German support group jointly organized the dCache workshop at DESY, Hamburg. It included an installation hands-on during day one as well as a dCache debug session on day three. Day two was filled with interesting talks. We presented what was new in dCache between last year's workshop and this year's. We talked about Federated Identity and Federated Storage and what is happening within the LSDMA project. We presented a dCache external service to transparently handle small files on dCaches with tape backend, handed over a comprehensive dCache toolbox to the participants and showed how Resilient Manager will change in the near future.

We also had a number of very interesting presentations held by our customers. Xavier Mol of Karlsruhe Institute of Technology presented his experience and measurements on running dCache inside a DDN on the disk controller in a virtual machine. Bastian Tweddell of Juelich Supercomputing Centre talked about the requirements and status of the Juelich Aachen Data Exchange (JADE). Hironori Ito of BNL presented the ATLAS way of accessing data through WebDAV and Fabio Martinelli of Paul Scherrer Institut talked about how he uses materialized views in PostgreSQL 9.3 for monitoring and accounting purposes.

We would like to thank all the speakers for their very interesting talks, all customers for their participation and we want to welcome everyone back next year. Maybe you even have topics you would like to present or have presented during next year's workshop. Please write to with any suggestions.

Please find the presentations on the indico page: 8th International dCache Workshop If you would like to have the group foto, please write to us and we will provide it to you.

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