Hi Ryan, even if the vast majority of systems should have only css0, I think that there are theoretically higher numbers possible (according to: https://www.redbooks.ibm.com/redbooks/pdfs/sg245444.pdf). The max amount of CSSes (channel sub-systems) is dependent on the system in use (i.e. the hw generation), and the today latest (z16) allows up to 6 (0 to 5). We might open it up for single digits (0-9).
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