Chapter 5. The DASD Dump Restore Program I ntrod uction
The DASD Dump Restore
under the centrol of com.and. It performs
direct access storage
functions are: Dump Restore Copy Print Type DUMP program executes CMS V1a the DDR
five functions for
devices. The five
The dump function saves data from a direct
access volume cn magnetic tape. The data
is saved cylinder by cylinder. The format
of the tape is: Record 1, volume header record --data
describing the volume. Record 2, track header record --a list
of count fields to restore the track and
the number of data records written on
tape. After the last count field the
record contains key and data records to
fill the 4K buffer. Record 3, track data records --key and
data recerds packed into 4K blocks with
the last block truncated. Record 4, either the end-of-volume or
end-of-job trailer label. The
end-of-volume label contains the same information as the next volume header
record except that the ID field contains EOV. The end-of-job trailer label
contains the same information as record
1 except that the cylinder number field
contains the disk address of the last
record on tape and the ID field contains
EOJ. RESTORE The restore function transfers data from a
tape created ty the DDR dump function te a device: Th€ data may be restored only
to a device of the same type as the device frem which it was dumped.
COpy
The copy function cOFies data from one
device to another device cf the same type. For disk-to-disk operations, data may be
reordered on a cylinder basis. If copying from tape-to-tape; the input tape must have
been created ty the DDR dump function. PRINT The print function prints both hexadecimal
and EECDIC representatiens of selected
records of a DASD or Tape Volume en a
printer .. TYPE The type function displays at the terminal
both hexadecimal and EBCtIC representations
of selected records of a tASD or tape
volu.e. Chapter 5. lhe D1SD Dump Restore Program 93
Method of Operation
The method of operation diagrams describe
the major functions of the DDR (DASD Dump Restore) program. The relationship of the method of operation diagrams is described
in Figure 5-1. Diagram 5-1 describes
functions of the DDR program. the major Diagram 5-2 shows the control statement
Frocessing for the DDR •• Diagram 5-3 describes the function.
Diagram 5-2 Diagram 5-3 DDR Program Control The Dump
Statement Function
Processing
Diagram 5-4
The Restore
Function
Diagram 5-1 Overview of the DDR
Program Diagram function.
5-4 cescribes the Restore Diagram 5-5 describes the copy function.
Diagram
function.
5-6 describes the Print Diagram 5-7 describes the Type function.
Diagram 5-5 Diagram 5-6 Diagram 5-7 The Copy The Print The TVpe
Function Function Function
Figure 5-1. Key to the DASD Dump Restore Program Method of Operation Diagrams 94 IBM VM/370 Service Routines Program Logic
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