Record type 2 (X'02') — Dump header

The SMF dump program writes record type 2 to the dump data set. It indicates the beginning of a dump of the SMF data set from a direct access device (usually to a tape). There are three variations of this record. If bit 1 at offset 4 is ON, then subtypes are supported; if the bit is OFF, the record consists of the standard SMF record header only.