On Fri, Jun 7, 2019 at 7:59 AM Peter Relson <[email protected]> wrote:
> Sorry for using the ALS nomenclature. I assumed "everyone" would know what > was meant by Architecture Levelset (AKA ALS). > Thanks. > > It means, for z/OS, that a release requires a specific set of hardware > features. Generally, that is enforced, so IPL will fail if not met. Those > features are usually provided by a particular generation of IBM machines. > But the ALS is to the list of features, not to a machine. This usually > relates to such complicating factors as running z/OS under z/VM or on zPDT > which might not support everything that a machine provides. > > z/OS 1.6 was an ALS to base z/Architecture. > z/OS 2.1 was an ALS to features provided in the z9 machine > z/OS 2.2 was an ALS to features provided in the z10 machine > z/OS 2.3 was an ALS to features provided in the zEC12 machine. > That's what I ASSuMEd, but I didn't find a definite definition when I did a Google search of ibm.com . So it is a _software_ concept in that z/OS developers assign it, rather than the hardware people says "this is a new ALS". Which explains why I can use EXECUTABLE=NO on a z/OS 2.2 system running on a z12 even though the hardware itself does not support EIP. > > Information about the features associated with each ALS is intended to be > put into one of the books in the next release (planning for migration?). > It was intended to have been surfaced in the announce material for each > release that had an ALS. I have no idea if that happened or not. > > Peter Relson > z/OS Core Technology Design > -- This is clearly another case of too many mad scientists, and not enough hunchbacks. Maranatha! <>< John McKown
