Logical File Name

The logical file name (LFN) is the unique name of a file in an abstract "grid space", e.g.,

/grid/dteam/users/graeme/dm_test/foobar

This name is independent of any Storage URL, with the File Catalog mapping these LFNs to SURLs.

When used as a URL, the schema is lfn:,

lfn:/grid/dteam/users/graeme/dm_test/foobarbaz

In LCG it is each experimental VO will have a separate file catalog, so their LFN spaces will be independent of one another.

LFNs can also be known as Aliases.