Thomas KUHR
U Karlsruhe

Computing at Belle II

The Belle II experiment, a next-generation B factory experiment at KEK,
is expected to record a two orders of magnitude larger data volume than
its predecessor, the Belle experiment. The data size and rate are 
comparable to or more than the ones of LHC experiments and requires to
change  the computing model from the Belle way, where basically all
computing resources were provided by KEK, to a more distributed scheme.
While we adopt existing grid technologies for our baseline design, we 
also investigate the possibility of using cloud computing for peaking
resource demands. An important task of the computing framework is to
provide easy and transparent access to data and to facilitate the
bookkeeping of processed files and failed jobs. To achieve this we set
up a metadata catalog based on AMGA and plan to use it in a bookkeeping
service that is based on concepts implemented in the SAM data handling
system used at CDF and D0. We also investigate the applicability of the
DIRAC system for Belle II. For the data acquisition, event
reconstruction, Monte Carlo simulation, and physics analysis a common
modular software framework is developed. It used root for persistency
and python as a steering language. In this talk the expected Belle II
performance and the resulting computing requirements are presented and
the status and plans of the core components of the computing
infrastructure are shown.