M ( 1 * C  DFU V2.4  !

DFU V2.4






Abstract

7DFU Disk and File Utilities for OpenVMS VAX and Alpha 

(Revision Information: This manual supersedes V2.2 

Date: August 1996 

$Operating System: 1OpenVMS VAX V5.5-2 thru 7.1, Alpha V6.1 thru 7.1 

Note: Part of the Freeware CD-ROM 




*OpenVMS Freeware for VAX and AXP Systems 

:The OpenVMS Freeware CD-ROM contains free software tools 6and utilities to aid software developers in creating 6applications and managing and using OpenVMS systems. 

9Many of these tools are popular packages already widely 9known and in use, while others are internally developed 9Digital tools our engineers are making available to our =OpenVMS customers. For example, the OpenVMS Freeware CD-ROM 9includes Bliss-32 for OpenVMS VAX, Bliss-32 for OpenVMS $AXP, and Bliss-64 for OpenVMS AXP. 

/Disclaimer on Testing, Quality, and Licensing 

8The OpenVMS Freeware for VAX and AXP Systems CD-ROM is 7provided "AS IS" without warranty. Digital imposes no =restrictions on its distribution, nor on the redistribution 8of anything on it. Be aware, however, that some of the 8packages on the CD-ROM may carry restrictions on their <use imposed by the original authors. Therefore, you should =carefully read the documentation accompanying the products. 

:Digital Equipment Corporation is providing this software 6free of charge and without warranty. Included in the 6[FREEWARE] directory on this CD are the GNU software 8licenses. Unless otherwise stated in sources or source ;packages, the GNU licenses cover all software supplied on this CD. 

=Digital makes no claims about the quality of this software. 3It is provided to the customer as a free service. $

Copyright©August 1996




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Contents

  


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Chapter 1
Introduction



=The Disk and File Utilities (DFU) is a high perfomance tool Imeant as an aid to the system manager who is responsible for monitoring /and maintaining disks, files and directories. IIt makes use of low level I/O features of VMS. As a result a high level @of performance is reached with minimal overhead on the system. CDFU supports all types of disk sets which comply to the VMS ODS-2 standard ?such as volume sets, stripe sets , shadow sets and RAID sets, and combinations of these. 

DDFU does NOT work on Spiralog disks. Trying to use DFU on spiralog Fdisks will produce the error "%DFU-E-NOTF11, Device does not have an ODS-2 filesystem" .  6

1.1 Support on DFU



;Although there is no official support on DFU you may send 1questions/remarks/bug-reports to the author via /internet address dorland@utrtsc.enet.dec.com. EA next version of DFU will no longer work on VMS 5.5-2 and VMS 6.0.  ;

1.2 General description



@DFU provides the following functions (in alphabetical order) :