LFC Summary

Users and applications need to locate files (or replicas of files) on the Grid. The LCG File Catalogue (LFC) is a service that maintains mappings between Logical File Names (LFN) and Grid Unique IDentifiers (GUID) or Storage URLs (SURL).

The UK has a number 'top level' LFCs available to users. The availability of these is tested every 15 minutes by submitting queries about replicas of a certain ATLAS file to each LFC. If such a query has been successfull within the last 30 mins then the status is "Good". If such query has been success within the last 60 mins then the status is "Fair". Otherwise the status is "Bad".