Castor: CERN Advanced STORage Manager
Summary
CASTOR is CERN's Advanced STORage Manager, a hierarchical storage management system for archiving physics data with very large volumes. It provides access via XROOT and GridFTP, with RFIO previously supported, and comprises five modules: Stager, Name Server, Tape Infrastructure, Client, and Storage Resource Management. The system uses tape storage (e.g., Oracle StorageTek T10000C and IBM TS1140) and central databases to track state, with CASTOR gradually evolving toward its successor CTA.