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For many years, storage systems in science, especially in High Energy Physics, could be split into two categories. The ones where data can be easily accessed through a mounted file system providing the standard posix file protocol and the others which support HEP specific protocols and which are aiming for utilizing affordable heterogeneous commodity hardware but nevertheless are supposed to scale into the double digit petabyte range. With the definition of the Network File System protocol V4.1(pNFS) industry for the first time provides a mechanism allowing the dCache technology to merge both domains.
by Tigran Mkrtchyan, DESY
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Most grid projects offer support groups for their users. In Germany, two such groups have joint forces to provide excellent storage support for their projects. Learning from experience, they emphasize training for dCache administrators.
by Dr. Christopher Jung, KIT
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dCache supports a "hot-spot replication" feature. The idea is that "hot" pools, ones that are suffering heavy use, are detected. When the Pool Manager receives a request to read data only stored on a hot pool it will copy data from the hot pool to a less-loaded pool. When this pool-to-pool transfer completes the request may be satisfied by another pool. Since the new replica will be on a less-loaded pool, the Pool Manager will chose the freshly created file in preference to to heavily loaded pool, so distributing load away from the hot pool.
by Dr. Paul Millar, DESY
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The most recent version of dCache supports the WebDAV protocol, providing standards based access from any user's desktop. All major operating systems are supported, including Windows, Mac OS X, and Linux, without the need for custom client software. Support in the operating system's native file management clients provides easy and seemless integration between local storage, network drives and grid storage, with drag and drop access to browse, copy, move, and delete files.
by Dr. Gerd Behrmann, NDGF
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The dCache SRM Server now has experimental support for distributed SRM deployment, allowing it to achieve higher availability and scalability. The distributed functionality of the SRM server is powered by Terracotta Scalability Platform.
by Timur Perelmutov, FERMIlab
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Maybe you are operating the largest dCache, or the fastest dCache or there is any other storage related information you would like to share with data management experts around the world. Why not just submit an article to dCache.org..
by Patrick Fuhrmann
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