IBM works with "supported migration paths". They are given by the N-2 formula, where N is the target version of z/OS you want. So, it's supported to migrate to v2.2 from 2 previous versions (v2.1 and v1.13). Of course you can do it in the unsupported way (I've seen that some times), but remember you probably will not have much help from IBM in case of problems. We've done 1.13 -> 2.1 recently in a parallel sysplex shop and there was one Tolerance/Coexistence PTF missing which prevented the system to join the plex, so I suggest you to make sure you apply ALL these PTFs.
Lucas On Sep 9, 2015 07:41, "Timothy Sipples" <[email protected]> wrote: > 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 > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
