Use a DISPLAY DUMP operator command to get the status of all defined SYS1.DUMPxx data sets on direct access. The system displays the status in message IEE852I or IEE856I. The message indicates the full and available data sets.
DISPLAY DUMP,STATUS
See z/OS MVS System Commands for information aout the CHNGDUMP and DISPLAY commands. For a description of these messages, use LookAt or see MVS™ System Messages.