I've been discussing the idea of whether it would be possible/useful to write something to trap the hardware LPAR deactivation signal and use that to trigger an controlled emergency shutdown of z/OS. On VM and VSE, there is a trap present in the base OS that grabs that signal and starts a controlled shutdown of the OS (you can simulate it using the SIGNAL SHUTDOWN command on VM). z/OS doesn't seem to have any knowledge of this and proceeds to die horribly when the timer specified on the deactivate fires and the hardware goes away.
Seems to me that this would be a Good Thing to have even for a LPAR-only install (in case some operator deactivates the wrong LPAR, or some similar awfulness) -- z/OS could do what it could to save state and then go down as gracefully as the time allotted (the LPAR deactivate signal has an optional time delay parm) permits. (The original need for us was to trigger automatic shutdown of the System Z processing when the UPS battery was getting low on our zPDT development system). I have sample assembler code on VM to trap the signal, but am not sure how best to implement this on z/OS. Suggestions? Ideas? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
