Hi Tom,
I have seen it happen, both planned and unplanned. IIRC I did post a
question on this here or in the linux-390 list, some years ago.
We have shutdown guests through a signal, and sometime still do. And we
have had an unplanned outage because someone at our HMC stopped the LPAR
(don't know in detail what they've done). After starting the LPAR again
we noticed a SIGNAL had forced VM down. SFS was shutdown through a
signal, all others obviously were forced during VM shutdown. O, this was
back at zVM 4.4 so it's there for some while now.
We have tried to setup a good solution for shutting down VM and it's 2nd
level systems (linux, VM, VSE) but there are some risks. You should
ensure the guest will indeed correctly shutdown within the set time.
Either have a good automatic shutdown procedure triggered by the signal
or set the timeout to a high number. At VM you should trap the signal to
run a shutdown procedure for services that do not trap a signal, on VSE
you have to trap the signal and script a shutdown, a linux guest traps
the signal as an CTRL-ALT-DEL.
Regards, Berry.
Op 24-05-11 21:32, Tom Huegel schreef:
Sorry if this sounds dumb, but I seem to remember someone talking
about z/VM (CP) being enabled for SIGNAL SHUTDOWN that it could
receive from either hardware, or a first level z/VM. But I don't seem
to be able to find anything like that in my searches. Or is that
something in a future release?
