Unedited (Dump) Format

This option produces a complete hexadecimal listing of the DSCBs in the VTOC. The listing is in an unedited dump form, requiring you to know the various formats of applicable DSCBs. The VTOC overlay for IEHLIST listings of VTOCs in dump format is useful in identifying the fields of the DSCBs.

For non-indexed VTOCs, this listing contains:

DSCBs dumped, in physical-sequential order.
Totals of unallocated cylinders, unallocated tracks, and unallocated (Format 0) DSCBs.

For indexed VTOCs there are two types of dump listings. These types are specified using the INDEXDSN parameter.

If INDEXDSN is omitted, the listing contains:

DSCBs dumped in physical-sequential order.
- If the device has 64K or less tracks, then one token Format 5 DSCB is identified.
- If the device has more than 64K tracks, then both a token Format 5 DSCB and a token Format 7 DSCB are identified.
Unformatted free space information.
Totals of unallocated cylinders, unallocated tracks, unallocated (Format 0) DSCBs, and unallocated VIRs.

If INDEXDSN=name is specified, the listing contains, in addition to the items above:

A dump of the space and allocation information.
If the VTOC index is disabled, both allocated and unallocated records are dumped in physical-sequential order.
If the VTOC index is disabled, a statement is included to this effect.

Note: For large volumes, the number of available DSCBs has a maximum value of 65␠499 for indexed VTOCs while the summary section shows the correct blank DSCBs.

Related reading: For information about he various formats that data set control blocks can assume, see z/OS DFSMSdfp Advanced Services.