If the DR site is running you under VM (as most do because it allows you to 
keep your CPUID the same as your production system), then things will work 
perfectly and you can not worry about anything.  If on the other hand you are 
going to run on some z/196 LPAR directly, then the success will depend on what 
you are expecting to work.  

Will it IPL, yes, but many things you may want to do will probably not function 
simply because the support code just isn't going to be there for you.  Things 
like EREP and RMF will completely fail (which you probably could care less 
about).  Your WLM constructs will probably fail,but WLM itself will still 
function, but unless you are using some of WLM's extended features, you 
probably won't care about that either.  If you aren't running under VM, the 
chances of your I/O configuration just happening to match the z/196 is remote 
anyway, so you will be making some drastic changes just to try to support the 
HCD requirements (You can't generate a IODF from z/OS 1.4 that will work on a 
native z/196, but I have ways around that if you "really" need to do it). 

If you can't guarantee that you will be coming up under VM, then the "safest" 
bet for you is to migrate to a higher level of z/OS.  The cost is minimal and 
any products that are increased in cost will probably be cancelled out by the 
ones that are cheaper or free now.  I don't know what machine type you are 
running on now, but it would (probably) be safe for you to migrate to z/OS 1.10 
through 1.13 for most of them (including the original z/800).  

My specialty is helping people do those kinds of migrations and as such I have 
compiled a huge database of what software will work under what releases of 
z/OS.  For the most part, unless the software you were running on z/OS 1.4 was 
already out of date when you installed it originally, it will probably continue 
to function on z/OS 1.10+.  You may have some other things that need to be 
tweaked (i..e JES exits etc.) but chances are that you are fairly vanilla by 
now to make getting off that mainframe easier anyway and for the most part the 
conversions of that type of code is seriously simple.

You can convert as a project for yourself, or you can have a company like mine 
do it for an extremely low cost, (or you can have IBM do it for an arm or a 
leg:)).  If you need help doing this on your own, or if you want us to do it 
for you, please feel free to contact me off list.  

I have helped close to 100 sites do these kinds of migrations, even the ones 
that did it themselves as several on the list will be able to verify, and if 
there are any questions I can answer for you, please feel free to contact me.

Brian Westerman
Syzygy Incorporated

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