Use the AMDSADDD utility to define a stand-alone dump data set. Specify a volume list (VOLLIST) in AMDSADDD to designate a list of VOLSERs corresponding to each DASD volume making up the data set. You can allocate a multivolume data set using the specified list of volumes. The device number of the first volume is used to specify the data set to stand-alone dump. Again, each volume should be on a different LSS to ensure parallelism when writing the dump. For a sample job that uses AMDSADDD to generate the SADMP data set, see IBM System Test example. Be sure to catalog your SADMP data set to prevent the possibility of accessing the wrong version of the data set when using IPCS COPYDUMP later.
For additional details, see the topic on Using the AMDSADDD utility in z/OS MVS Diagnosis: Tools and Service Aids.