DFU, Storage_Mgmt, V3.1-1 High-Performance Disk/File Utility.

DFU V3.1-1 Disk and File Utilities is a high-performance utility 
developed to perform both routine maintenance and special-purpose
operations on disks, files and directories.  The functionality
offered by DFU is not available or is only partially available
through other DCL commands; through standard OpenVMS utilities.
 
Available functions :
 - DEFRAGMENT one or more files
 - DELETE files by file-id; delete directory(trees) fast
 - DIRECTORY functions : COMPRESS or DUMP directories
                       : search directories for files with 
                          multiple versions , alias files 
                          or empty directories
                       : create directories with 
                          preallocated size
 - REPORT disk for file, freespace and disk usage 
    statistics 
 - SEARCH very fast for specific files
 - SET : change many file attributes
 - UNDELETE files
 - VERIFY and REBUILD of the disk structure

PCSI installation kits for OpenVMS Alpha and OpenVMS I64
are provided.  No DFU kit is available for OpenVMS VAX,
nor is a VAX kit currently expected.