Just because they added something to the hardware, does not mean they are ready to add it to the operating system.
When z/VM 6 came out, it required a z10 to run on, because they changed the software to use hardware introduced with that processort. Which means they need to support z/VM 5 on older processors until they upgrade or exceed the reasonable hardware lifetime. When z/OS 2.1 comes out, it will drop support for z/900 and z/990 processors so they can use hardware feature only available on newer hardware. You can still run z/OS 1.13 on older processor but not take advantage of the newer hardware. They may be taking advantage of newer hardware features, but some features you can't fully utilize until all LPARs have the proper hardware and software levels. On Thu, May 31, 2012 at 11:34 AM, Charles Mills <[email protected]> wrote: > Great stuff Chris, thank you! > > The problem I have had with a lot of things like this is that the PoOp > describes the hardware in a vacuum, as though z/OS did not exist. (As it > probably should.) It is also "non-judgmental" -- never says "this > instruction is basically an antique, or is likely to get you into trouble -- > use this other one instead." Then the z/OS manuals describe things using > z/OS terminology, and it is hard to pull the whole big picture together: you > can use this hardware facility thusly in the z/OS environment. There is some > whole addressing mode as I recall that the PoOp spends a bunch of time on > but that z/OS does not support, so it is basically useless unless you are > running (or writing!) some OS other than z/OS. > > This presentation is great! > > Charles -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
