This has come up on this list a number of times. So far as I can remember , there is no way for a second level (guest) VM system to determine the system identifier of the first level (host) VM system without a first level mod or the first level system writing it somewhere (disk, VCTCA, other?) that the second level system can read. DIAG 00 does not have this information. STS I does not have this information. I'm not aware of any CP command or DIAG code that has this i nformation.
I'd love to be proved wrong! I need this information. Does anyone actuall y have code that will show the first level system identifier from the second level system without a mod to the first level system? I think this also extends to a Linux guest of the the second level system , but again I could be wrong. Alan Ackerman
