The following is an extract from: "The LHC computing grid project at CERN" (Lamanna, 2004)

The first service of the LHC Computing Grid, called LCG-1 was opened on September 15th, 2003, with 25 sites worldwide. In this phase, the goal was to allow the experiments to try out the system and test their software on it. Although incomplete in functionality, in particular, due to some limitation in the data management interface to tertiary storage, LCG-1 is demonstrating very good stability and serving as a basis for the users to prepare for the 2004 data challenges.