Reliable Date-Replication Using Grid Computing Tools

Abstract

The LHCb detector at CERN is a physical experiment to measure rare b-decays after the collision of protons in the Large Hadron Collider ring. The measured collisions are called “Events”. These events are containing the data which are necessary to analyze and reconstruct the decays. The events are send to speed optimized writer processes which are writing the events into files on a local hard disk cluster. Because the space is limited on the hard disk cluster, the data needs to be replicated to a long term storage system. This diploma thesis will present the design and implementation of a software which replicates the data in a reliable manner. In addition this software registers the data in special databases to prepare the following analyzes and reconstructions. Because the software which is used in the LHCb experiment is still under development, there is a special need for reliability to deal with error situations or inconsistent data. The subject of this diploma thesis was also presented at the “17th International Conference on Computing in High Energy and Nuclear Physics” (see [CHEP09PR]). A paper about this subject will also be published in the “Journal of Physics: Conference Series”