What do you think about coexistence of 2.10 and 1.6 sharing VSAM, Master and User Catalog, DFSMS Control Dataset...
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and CA TPX? Do you think we have some chance to migrate immediately to z/OS 1.6?
I think you will be at very high risk of running into major problems if you attempt to share things like catalogs and the SMS Control Dataset (ACDS) between OS/390 V2.10 and z/OS V1.6. For example, PTF UA00440 is required to share the ACDS between an OS/390 V2.10 and z/OS V1.4. The PTF will prevent corruption of the ACDS on the OS/390 V2.10 system when it is shared with a z/OS V1.4 system. You run the same risk with a z/OS V1.6 system, except that no similar PTF is available. Similarly, there is a good chance that the format of VTOC, VVDS and other control records may have changed. Attempting to share resources between z/OS V1.6 and OS/390 V2.10 is entirely at your risk (and unsupported by IBM), so if you end up having problems, you'll end up the proverbial creek without a paddle. It's a risk I'd never run.
As for TPX compatibility, you need to contact Computer Associates for a definitive answer, but since it is a VTAM application, I think your chances of coexistence/fallback support are much better.
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