I consider myself further educated on the nuances of VM moderne. ;-) There was one comment about 'a partition that is running ARCHLVL 1' that I think needs fleshing out. Looking only at bare metal without the smoke and mirrors of VM, ARCHLVL is not selectable by LPAR. A CEC is either ARCHLVL 2 or not, such as 2064 or 9672. On a given CEC, in other words, an 'ESA/390' LPAR initializes only one way. If z/OS detects ARCHLVL 2, then that's the only way it will run UNLESS Bimodal Accommodation is installed, which allows ARCHLVL to be selected at IPL time via LOADxx.
Some combination of VMs may mask the CEC ARCHLVL, but my advice to the original poster remains the same: install Bimodal ASAP if only because a workable VM environment may be impossible to achieve in a DR situation. Only Bimodal assures that you'll be able to run in any environment on a moment's notice. . . . JO.Skip Robinson Southern California Edison Company SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile [EMAIL PROTECTED] IBM Mainframe Discussion List <[email protected]> wrote on 06/24/2005 10:38:06: > Craddock, Chris wrote: > > >>I thought you said there was a way in z/VM to restrict a guest to run > >>ESA/390 and not switch to z/Architecture. But I'll be damned if I can > >>find it now. > >> > >>Thoughts? > >> > >> > > > >IANA VM weenie, but I would guess that if the VM is IPL'd into > >a partition that is running ARCHLVL 1, then the only thing a > >guest could "see" would also be ARCHLVL 1. IOW it would be an > >implicit "feature" of the environment that the VM ran in. > > > > > > I accidentally posted a private message to the list. :-[ > > z/OS guests running under the latest z/VM will switch to z/Architecture > mode. Guests running under VM/ESA -- even on a zSeries machine -- see > only ESA/390 architecture. In that case z/OS will *not* switch to > z/Architecture mode. (This may also be true of some earlier z/VM releases.) > > You can run z/OS as a guest under VM/ESA in its own LPAR or as a > 2nd-level guest under VM/ESA running as a guest of z/VM. Either way, > z/OS will *not* switch to z/Architecture mode. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
