Patent 7885930 was granted and assigned to Hitachi on February, 2011 by the United States Patent and Trademark Office.
The correspondence relationship between local paths in local namespaces for snapshots FS0-SNAP0, FS1-SNAP0, and FS2-SNAP0 of file systems FS0, FS1, and FS2 and global paths in a global namespace for those snapshots is defined so that the directory configuration in the global namespace of the snapshots FS0-SNAP0, FS1-SNAP0, and FS2-SNAP0 becomes the same as the directory configuration in the global namespace of the file systems FS0, FS1, and FS2.