Mark Wilson wrote: >They have asked what is the latest z Hardware they can use whilst running >OS/390 2.5, but I am struggling to find any info out there at the moment.
I'm puzzled why an upgrade is not possible, but, to answer your question directly, none of IBM's z/Architecture machines (z900 and later) ever officially supported OS/390 2.5. The IBM z900 only went as far back as OS/390 2.6. The most recent machines that officially supported OS/390 2.5 are G5 and G6 machines that were state-of-the-art 17+ years ago (Machine Type 9672 G5 and G6 processors). Small, late era 31-bit machines that supported OS/390 2.5 included the IBM Multiprise 3000 (Machine Type 7060) and IBM S/390 Integrated Server (Machine Type 3006). IBM R/390, P/390, and P/390E cards also officially supported OS/390 2.5. (The IBM S/390 Integrated Server uses the P/390E card.) Unofficially, there was a report back in 2009 in this forum that OS/390 2.4 IPL'ed under z/VM 5.3 on an IBM z990 machine. There were some restrictions (512MB memory or less, 1 CP only, and a special z/VM setting). CAUTION: OS/390, 31-bit z/OS, and their ancestors must be licensed to the full capacity of the physical machine. They also "contaminate" a machine from a licensing point of view. If there's any pre-64-bit MVS family operating system running on the machine, then any 64-bit z/OS -- and all IBM products on both the pre-64-bit MVS family and 64-bit z/OS operating systems -- are also charged at the full physical machine capacity. IBM's sub-capacity z/OS licensing (WLC and successors) only applies when the entire machine is free of 31-bit z/OS and its ancestors. z/OS 1.5 was the last release that was capable of starting in ESA (31-bit) mode, although it could IPL in 64-bit mode on compatible z/Architecture machines. -------------------------------------------------------------------------------------------------------- Timothy Sipples IT Architect Executive, Industry Solutions, IBM Z and LinuxONE, AP/GCG/MEA E-Mail: sipp...@sg.ibm.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
