For the record, you can migrate from *any* operating system/operating system release you like to z/OS 2.2. IBM hopes you do as expeditiously as possible and reasonable.
Migrations to z/OS 2.2 only from these releases: z/OS 1.13 z/OS 2.1 include IBM supported "coexistence" and "fallback." Many customers want and appreciate having coexistence and fallback capabilities, and so they make efforts to stay at least reasonably current on their operating system releases. Having those capabilities helps reduce risks and the work effort involved in migrations. But you are NOT required to exploit coexistence and fallback capabilities. Yes, you can migrate directly from, as one example, z/OS 1.11 to z/OS 2.2 -- without coexistence/fallback.(*) I should also point out that "coexistence" is not the same word as "co-located." Yes, it is possible to migrate from z/OS 1.11 to z/OS 2.2, as one example, and have both those operating system releases be co-located on the same physical machine. "LPARs work," to put it simply. The IBM definition of coexistence is a different concept, discussed in the z/OS migration guides. (*) For perspective, the rest of the IT world does not have coexistence and fallback, at least not to the level IBM offers. -------------------------------------------------------------------------------------------------------- Timothy Sipples IT Architect Executive, Industry Solutions, IBM z Systems, AP/GCG/MEA E-Mail: [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
