I don&#x27;t know how they decommission a zSystem.<p>But from what the mainframe guys at work told me, hardware between 2 z boxes are pretty much the same and it&#x27;s kind of licensed by load usage or components usage.<p>So if you want to downgrade or upgrade memory&#x2F;CPUs&#x2F;etc. (to a certain degree), it&#x27;s just a matter of having an IBM tech to enter the right license in the console.