To get a dump of a SYS1.DUMP data set, use IPCS as described in z/OS MVS IPCS User's Guidez/OS MVS IPCS User's Guidez/OS MVS IPCS User's Guide. The SDUMP macro allows VIO recovery routines to take limited dynamic (automatic) dumps containing volatile work areas before the areas are swapped out or modified. SDUMP macros are issued to generate dumps that record the status of the current environment whether retry or percolation is performed.