At 12:47 -0500 on 07/07/2011, Alan Altmark wrote about Re: Trapping
the LPAR Deactivate signal on z/OS?:
When registered for the deactivation signal, there is a delay
between the time the deactivation is requested and when it occurs.
In an LPAR on a z10, the delay is 5 minutes. If the OS comes down
sooner than that, the LPAR deactivates sooner.
That is nice BUT there needs to be coordination between the LPAR and
the Z/OS system running in it. The way you describe it, the LPAR
tells Z/OS to shut down in 5 minutes or face what amounts to a
UPS-Less power failure of the LPAR emulated CPU. What should be done
is to support an interface where Z/OS acknowledges the Shut Down
Order from the LPAR and have the LPAR wait for Z/OS to send a "I'm
Shut Down" signal to the LPAR. There should not only be a 5 minute
shutdown clock but a "I'm pulling the rug out from under you" clock
that kicks in after the 5 minutes have expired and Z/OS is still
shutting down and still has not completed. This way it gets one
extension before the LPAR crashes it.
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