From: arne@vajhoej.dk   
      
   On 11/12/2025 4:02 PM, Lawrence D’Oliveiro wrote:   
   > On Wed, 12 Nov 2025 14:54:13 -0500, Arne Vajhøj wrote:   
   >> On 11/11/2025 10:56 PM, Lawrence D’Oliveiro wrote:   
   >>> No mainframe can match that.   
   >>   
   >> Of course mainframes can match that.   
   >   
   > Nobody can afford to buy enough mainframes to match that.   
   >   
   >> IBM mainframes use OS clustering (like VMS) called   
   >> SysPlex.   
   >   
   > Do either of those scale to 460,000 nodes?   
   >   
   > No, they don’t.   
      
   I believe the topic was whether mainframes can achieve   
   the availability - the required number of nines. They   
   can.   
      
   Whether mainframes can do web scale like Google Search   
   and FaceBook is a totally different question. I don't   
   think they can - they are not designed for that level   
   of scalability.   
      
   Arne   
      
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