Hello Rebeca Normally new Z hardware like z16 need new z/OS releases it is not clear what you really need, because you can upgrade your z/OS 2.1 to 2.3 or 2.4 in your current machine and after you upgrade your current hardware to z16.
If the case is to maintain running z/OS 2.1 and z/OS 2.3 and move to a z16 first probably will not work, unless you install z/VM 7.3 and them you can run all version of z/OS 2.1 z/OS 2.2 and z/OS 2.3 as a guest machine under z/VM 7.3 or z/VM 7.4 that support z16 and you can run any version of z/OS in this case as each one in a machine. It is different as LPAR because LPAR will be under the z16 and you cannot run old z/OS direct in z16, under z/VM it supports the old system z/VM is a Virtual Machine you can emulate anything, and it remain direct with z16 and z/OS remain under z/VM and no issue that I know. Giovanni z/OS System programmers -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Rebecca Martin Sent: Tuesday, January 14, 2025 3:01 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: z/OS 2.1 & 2.2 on z16? I know z/OS 2.1 and 2.2 are not supported release of z/OS. I also know that the z16 spec sheet states that z/OS 2.3 is the oldest release of z/OS supported. But the z16 spec sheet has a 2022 date when z/OS 2.3 was the oldest supported release. I don't think IBM would list a release of z/OS for any hardware that is not a supported release of z/OS. I need to know if we can run a z/OS 2.1 or 2.2 LPAR on a z16? If you have done so, did you have any issues? If you tried and it didn't, please share. Thank you, Rebecca ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
