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SlurpingPus@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

Iirc some mainframe OSes, like z/OS or whatever, support running different OSes atop them.

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AnUnusualRelic@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
Isn’t that in some kind of virtual machines?

I’m not familiar with those, the only “big” machines I worked with were Tandem.

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- SlurpingPus@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
  Idk for sure, haven’t properly looked into it. Just read in passing that mainframes were doing this kind of thing for ages.
  
  Wikipedia says regarding z/OS:
  
  z/OS has a Workload Manager (WLM) and dispatcher which automatically manages numerous concurrently hosted units of work running in separate key-protected address spaces according to dynamically adjustable goals. This capability inherently supports multi-tenancy within a single operating system image. However, modern IBM mainframes also offer two additional levels of virtualization: LPARs and (optionally) z/VM.
  
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