Got it! Thanks for all the explanations. Makes perfect sense when you think about it.
-----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Alan Altmark Sent: Thursday, January 25, 2018 12:01 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] Box confusion On Thursday, 01/25/2018 at 07:38 GMT, Marcy Cortes <marcy.d.cor...@wellsfargo.com> wrote: > Thanks! > > Shutdown -r did take them from a z13 to a z14 (no vm logoff). Are you saying > it wouldn't downgrade them as well? Yes, that's what I'm saying. CP won't fence an upgrade from a virtual machine. If it doesn't use new facilities, no problem. If it does, cool. But in a downgrade scenario, you could lose instructions and die a horrible death, so it takes a virtual system reset to get CP to turn off the fence and let the downgrade through. Alan Altmark Senior Managing z/VM and Linux Consultant IBM Systems Lab Services IBM Z Delivery Practice ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
