z/VM: CP Commands and Utilities Reference - z/VM - IBM

4. DDR copies mode zero (private) files from a CMS disk, regardless of whether
the disk is linked R/O or R/W.
5. Results are unpredictable if you use DDR to copy data from one minidisk to
another minidisk unequal in size (for example, the output disk contains fewer
cylinders or blocks than the input disk).
6. If the DDR stand-alone utility is IPLed from tape with a LOADPARM of
AUTOxxxx, it automatically restores the tape to the DASD with device address
xxxx. No output is produced on the console. Command completion is indicated
by loading a disabled wait PSW. A wait code of zero in this PSW indicates a
successful restore; a non-zero wait code signals an unsuccessful restore. See
z/VM: System Messages and Codes - CP for PSW wait state details.
7. DDR writes its own tape marks after a dump. It reads past any tape marks
found between dumps during a restore.
DDR Control Statements
DDR control statements describe the intended processing and the needed I/O
devices. Specify I/O definition statements first.
All control statements may be entered from either the console or the card reader.
The program inspects only columns 1 to 71. It ignores all data after the last
operand in a statement. Since the output tape must have the DASD cylinder header
records in ascending sequences, you must enter extents in sequence by DASD
location (that is, in sequence by cylinder number if this is a count-key-data device).
You may specify only one type of function to be performed in one execution.
Choose from:
v Dump
v Restore
v Copy.
You may enter up to 300 statements describing cylinder or block extents.
The function statements are delimited by an INPUT or OUTPUT statement, or by a
null line if the console is used for input. If additional functions are to be performed,
the sequence of control cards must be repeated. If you do not use INPUT or
OUTPUT control statements to separate the functions you specify, an error
message (HCP702E) is displayed when the input is read from a card reader or
CMS file. The remainder of the input stream is checked for proper syntax, but no
further DDR operations are performed. Only those statements needed to redefine
the I/O devices are necessary for subsequent steps. All other I/O definitions remain
the same.
To return to CMS, enter a null line (carriage return) in response to the
prompting message (ENTER:). To return directly to CP, enter #CP.
DDR
Two logical line editing symbols are recognized and handled by the DDR command.
The first is the logical character-delete symbol (@) that allows deletion of one or
more of the previous characters entered. The second is the logical-line delete
symbol (¢) that deletes the entire previous physical line. Most often, the default
values for these two symbols are defined for each virtual machine at system
generation. When you use the CP TERMINAL command to redefine the CHARDEL
and LINEDEL characters, the redefinitions have no effect on DDR line editing. DDR
continues to recognize the at sign (@) and the cent sign (¢) as valid CHARDEL and
LINEDEL symbols, respectively.
Chapter 3. CP Utilities 1797