DFU, SYSTEM MANAGEMENT, High Performace disk/file utility.
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DFU Disk and File Utilities is a high performance utility 
developed to perform routine maintenance and special 
purpose operations on disks, files and directories. The 
functionality offered by DFU is not or only partially 
available through other DCL commands or VMS utilities.
 
Available functions :
 - DEFRAGMENT a single or a small number of files
 - DELETE files by file-id; delete directory(trees) fast
 - DIRECTORY functions : COMPRESS or DUMP directories
                       : search directories for files with 
                          multiple versions , alias file 
                          entries , empty or corrupted 
                          directories
                       : create directories with 
                          preallocated size
 - quick disk REPORTING for file, freespace and disk usage 
    statistics 
 - quick diskwide SEARCH for (specific) files
 - SET or Change many file attributes
 - UNDELETE files
 - quick VERIFY and REBUILD of the disk structure