From: arne@vajhoej.dk   
      
   On 11/3/2025 8:31 AM, Simon Clubley wrote:   
   > On 2025-10-30, Arne Vajhøj  wrote:   
   >> On 10/30/2025 9:12 AM, Simon Clubley wrote:   
   >>> z/OS is responsible for keeping a good portion of today's world running.   
   >>> I would hardly call that a legacy OS.   
   >>   
   >> z/OS is still used for a lot of very important systems.   
   >>   
   >> But it is also an OS that companies are actively   
   >> moving away from.   
   >   
   > Interesting. I can see how some people on the edges might be considering   
   > such a move, but at the very core of the z/OS world are companies that   
   > I thought such a move would be absolutely impossible to consider.   
   >   
   > What are they moving to, and how are they satisfying the extremely high   
   > constraints both on software and hardware availability, failure detection,   
   > and recovery that z/OS and its underlying hardware provides ?   
   >   
   > z/OS has a unique set of capabilities when it comes to the absolutely   
   > critical this _MUST_ continue working or the country/company dies area.   
      
   > Likewise, to replace z/OS, any replacement hardware and software must also   
   > have the same unique capabilities that z/OS, and the hardware it runs on,   
   > has. What is the general ecosystem, at both software and hardware level,   
   > that these people are moving to ?   
      
   Mainframes were unique in last century regarding integrity, availability   
   and performance but not today.   
      
   Standard distributed environment, load sharing (horizontal scaling)   
   applications, standard RDBMS with transaction and XA transaction   
   support, auto scaling VM or container solutions, massive scaling   
   capable NoSQL databases.   
      
   It can be made to work.   
      
   It can also be made not to work, but ....   
      
   Arne   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)