  The CMS Integration Grid Testbed (IGT) comprises USCMS Tier-1 and Tier-2
hardware at the following sites: the California Institute of Technology, Fermi
National Accelerator Laboratory, the University of California at San Diego, and
the University of Florida at Gainesville. The IGT runs jobs using the Globus
Toolkit with a DAGMan and Condor-G front end. The virtual organization (VO) is
managed using VO management scripts from the European Data Grid (EDG). Gridwide
monitoring is accomplished using local tools such as Ganglia interfaced into
the Globus Metadata Directory Service (MDS) and the agent based Mona Lisa.
Domain specific software is packaged and installed using the Distrib ution
After Release (DAR) tool of CMS, while middleware under the auspices of the
Virtual Data Toolkit (VDT) is distributed using Pacman. During a continuo us
two month span in Fall of 2002, over 1 million official CMS GEANT based Monte
Carlo events were generated and returned to CERN for analysis while being
demonstrated at SC2002. In this paper, we describe the process that led to one
of the world's first continuously available, functioning grids.
