Rick, I don't think it matters what OS/390 release is running. But the OS/390
V2R10 is the first to be able to run and exploit the 64bit mode. In this case the OS/390 is V2R9, that would qualify the machine as ESA/390. So it can't run 64 bit but it can benefit from the 64bit functions of z/VM 4 64bit that will increase performance of the Host VM, such as increased storage. Regards, Berry.
