z/OS 1.4 and z/OS 2.2 are far enough apart that there was never a single IBM machine model that officially supported both releases. IBM supported running z/OS 1.4 up to the z9 models, and z/OS 2.2 starts with the z10 models. If you've got them both running on one CEC, it's lucky, and congratulations. Please make sure you're not running z/OS 1.4 in Bimodal Accommodation (ESA/390 31-bit mode), by the way, for at least two big reasons.
With that background, I don't think you can or should assume a single CEC "forever," or even for very long. At least, it'd be prudent not to "wire in" such rigidity. If you're still nervous, you can set up both EE and CTCA connections. I recommend configuring EE (over a HiperSocket if on the same CEC) as primary/favored since the performance characteristics are likely to be better, but you can backstop EE with CTCA if you wish. EE officially debuted with OS/390 Version 2 Release 7 in early 1999, was backported to OS/390 Version 2 Release 6, and was circulating in earlier form before that. EE certainly wasn't fresh off the boat with z/OS 1.4, which reached End of Service in 2007, over 8 years after EE debuted. z/OS 1.4 is plenty new enough for these purposes. I recall plenty of EE adoption in z/OS 1.4 and prior. -------------------------------------------------------------------------------------------------------- Timothy Sipples IT Architect Executive, Industry Solutions, IBM Z & LinuxONE, Multi-Geography E-Mail: [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
