From: ldo@nz.invalid   
      
   On Tue, 16 Sep 2025 21:47:08 +0100, David Wade wrote:   
      
   >> Especially given that z/OS is actually several years older than VMS   
   >> and is still going very strongly indeed.   
   >>   
   > I don't believe its as strong as you believe. Perhaps the Z platform   
   > is, but z/OS is pretty much limited to traditional big banks and   
   > airline reservation systems. These systems are all much larger that   
   > most VMS systems so migration away is harder and riskier. The   
   > hundreds of SMEs that once had a small IBM/370 like the 43xx or 9370   
   > have gone.   
      
   IBM as a whole has been losing money for years, and laying off staff   
   left and right. That’s not exactly the sign of a platform “going   
   strongly”, is it. The only recent bright spot in the company, that I   
   know of, is its Red Hat acquisition.   
      
   > Another notable feature of Z hardware is the virtualisation   
   > technology inherent in the "hardware". So it all comes with multiple   
   > Logical PARtitions or LPARs which despite their name are more like   
   > physical partitioning of the hardware, and zVM which uses the "Start   
   > Interpretive Execution" (SIE) instruction to create Virtual   
   > Machines.   
      
   Does that sound like there are a limited number of slots for   
   instantiating virtual machines? Modern virtualization architectures   
   aren’t limited like that.   
      
   > .. lets face it the competition such as pr1mos, hp-ux , Solaris, GCOS6   
   > are all in simiular states of decline...   
      
   Are new installations of any of those still being sold? Somehow I don’t   
   think so ...   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)