When you order z/OS 2.5 (or after if you have already done so), you need to order the COD package (you can do it from ShopZseries directly and get it electronically in under a day), which is a pre-built z/OS 2.3 (not 2.5 yet) system (with z/OSMF pre-installed) that you restore to a single volume by either 1)ipling DFDSS 2) or you can also do it from z/VM by ipling a DFDSS virtual machine, (actually any vm that can IPL from the file), pointing to the delivery data.
The COD can come electronically (or I think you can still order a DVD) in a format that you can IPL directly from your HMC console. I don't think that z/VM can IPL from a USB drive connected to the HMC yet, and the last time I did this (in 2020), I used an unused sandbox LPAR on (strangely enough) a z13s. If your z13 has only one LPAR (that currently runs z/VM), you will either need to: a) add a new LPAR via HCD and shutdown your zVM and power-on-reset the z13 to the newly created system with (now) two LPARs b) shut down zVM and IPL the USB or DVD (from the HMC) and install the volume to a empty 3390 (you can then reipl z/VM and finish the installation from a zos virtual machine that you create under zVM. The entire process of loading the COD from USB or DVD is about 10 to 15 minutes. I have had to do both of the above, and option 'b' is quicker because you don't have to generate an LPAR that the site might never use again. Once you have the COD zOS running in it's own LPAR or as a VM under zVM, you can log onto it and perform the installation of the 2.5 system from either z/OSMF or (if you received your 2.5 z/OS system as a systempac, you can install it that way. I have performed the installation from COD quite a few times, and it's fairly painless. It's a requirement if the site bought a new processor and the old process is so old that you can't install the newer OS from it. If you go the z/OSMF route, the COD system has z/OSMF pre-installed and it will automatically start up, and the ID's they give you are already set up to use z/OSMF, so it's pretty painless. I have found that most system programmers now-a-days have a VERY hard time getting z/OSMF able to run on older (pre z/OS 2.3) systems, so getting a COD is a quick way to bypass that issue. Hopefully your z13 is at least a 400Mip machine, because otherwise installation via z/OSMF can take a VERY long time, especially under a virtual machine. But the good news is that the entire process is actually really simple. You can sill install on a slower processor, but it will be frustratingly slow. If you need more help, feel free to contact me. Brian ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
