A separate fileset header is stored at the site of each copy of a DCE LFS fileset, regardless of its type (read/write, read-only, or backup). The data structure of the fileset header records the physical memory addresses of the files in the fileset on the partition on which the fileset is stored. The fileset header binds all the files into a logical unit without requiring that they be stored in contiguous memory blocks.
The header of a DCE LFS fileset includes the following information: the fileset's name; its fileset ID number; its type (read/write, read-only, or backup); its size; the ID numbers of its parent, clone, and backup versions; its creation date; and the date of its last modification.