Krzysztof Wrona

"Grid computing in daily life of a running physics experiment"

The detector and collider upgrades for HERA-II have drastically
increased the demand on computing resources for Monte Carlo production for
the ZEUS experiment. To close the gap, the existing production system was
extended to use grid resources. This extended system has been used in
production since November 2004. Using 33 different  Grid
sites more than 200 million events were simulated and
reconstructed exceeding the capacity of the old system. I will present
the production setup and introduce the toolkit that was developed by ZEUS
to use the existing grid middlewares efficiently. Finally, I will report
about our daily experiences on running mass production on the grid and our
future plans.