Last update:
Apr 1, 2000
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The Physics Analysis Server Project
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Greg Landsberg,
Richard Partridge
Brown University
Speaker:
Richard Partridge
We propose a new concept in handling multi-Terabyte data sets that are increasingly
common in HEP. The PHysics Analysis SERver (PHASER) unifies the power of the Physics Object
Database with a cheap modern robotic direct-access storage solution for quick and effective access
to a desired set of physics events. The Physics Object Database stores compact information about
the events, allowing for a query that selects a required subset out of few hundred million events
stored in the database in a matter of seconds. The DVD-RAM multi-Terabyte library that contains
DST-level information is then used to extract complete features of the desired events and serve
this subset to the user either via network or on the DVD-RAM media. Access to the PHASER system
will be done via Web interface that allows remotely located physicists to easily access the data,
which is very important for a large international collaboration, typical for a modern HEP
experiment. We present first tests of this new concept using 60 million events collected by the
D\O\ experiment in 1992-1996. We anticipate that the PHASER system will be one of the main physics
analyses tools for D\O\ in the next run. PHASER is particularly useful for international
collaborators who will be able to have a copy of the entire D\O\ data set locally at a moderate
cost. We expect PHASER to be easily applicable to other HEP experiments that deal with extremely
large data sets.
Presentation:  | Short Paper:  |
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