From: arne@vajhoej.dk   
      
   On 9/21/2025 6:35 PM, David Wade wrote:   
   > On 21/09/2025 21:31, Lawrence D’Oliveiro wrote:   
   >> On Sun, 21 Sep 2025 10:56:33 +0100, David Wade wrote:   
   >>> I remember looking at Alpha for Microsoft Exchange on Windows/NT. It was   
   >>> really hard to justify using an Alpha because Exchange is very IO   
   >>> intensive. You couldn't get enough RAID to use the CPU.   
   >>   
   >> Or maybe Windows NT (and Exchange) were just too inefficient. Did you   
   >> compare performance with DEC Unix on the same hardware? Linux was also   
   >> starting to build a reputation for offering higher performance on the   
   >> vendor’s own hardware than the vendor-supplied OS.   
   >   
   > Thats crap. Exchange is very efficient in terms of CPU use. It just   
   > hammers the disks. So how could adding an Alpha CPU increase   
   > performance. The alpha that is simply overkill. You could get the same   
   > performance, running the same OS on much cheaper, lower performance, in   
   > CPU terms boxes. You just need a mirror set for every 250 users...   
   >   
   > If you were Microsoft at the time you wanted Exchange which only runs on   
   > Windows so other OSs not an option.   
      
   For databases the argument was that 64 bit allowed for larger address   
   space and more memory and more caching would increase performance.   
      
   I don't know if that applies to Exchange as well.   
      
   Arne   
      
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