Chapter 5. The DASD Dump Restore Program I ntrod uction
TheDASD Dump Restore
under the centrol ofcom.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 datafrom a direct
accessvolume 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 thesame information as the next volume header
recordexcept that the ID field contains EOV. The end-of-job trailer label
contains thesame information as record
1except 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 createdty the DDR dump function te a device: Th€ data may be restored only
to a device of the same type as the devicefrem which it was dumped.
COpy
The copy functioncOFies data from one
device to another device cf the sametype. For disk-to-disk operations, data may be
reordered on a cylinder basis. Ifcopying from tape-to-tape; the input tape must have
been createdty the DDR dump function. PRINT The print function prints both hexadecimal
andEECDIC representatiens of selected
records of aDASD or Tape Volume en a
printer ..TYPE The type function displays at the terminal
bothhexadecimal and EBCtIC representations
of selected records of atASD or tape
volu.e.Chapter 5. lhe D1SD Dump Restore Program 93
The
under the centrol of
direct access storage
functions are:
five functions for
devices. The five
The dump function saves data
access
is saved cylinder by cylinder. The format
of the tape is:
describing the volume.
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.
data recerds packed into 4K blocks with
the last block truncated.
end-of-job trailer label. The
end-of-volume label contains the
record
contains the
1
contains the disk address of the last
record on tape and the ID field contains
EOJ.
tape created
to a device of the same type as the device
COpy
The copy function
device to another device cf the same
reordered on a cylinder basis. If
been created
and
records of a
printer ..
both
of selected records of a
volu.e.