System Generation (OS)

The SysGen process runs as a series of jobs under the control of the operating system.

For new installations, IBM provides a complete pre-configured driver system, which is intended only for preparing for and running the sysgen, not for production use.

Stage 1 is the compilation of a sequence of assembler macro instructions describing the configuration to be installed or updated.

By Release 13 the old terms SSS, MSS, and MPS had been replaced by PCP, MFT, and MVT.

This process is now obsolete; it was initially[12] replaced by the use of SMP/E, IOCP[13] and MVSCP,[14][15][16] then later by SMP/E and Hardware Configuration Definition (HCD).