> which raises a question I've been pondering for some time...
> What's a reasonable upper limit on the number of Linux guests on a
> well-proportioned Z these days?

It's not about size of the machine, it's what you do with it. 8-)

For anything other than trivial workload, "hundreds to thousands". It
still depends a lot on what you want to do with them. Small, spiky
workloads will allow the thousands number. Websphere or Oracle: dozens. 

> Has anyone pushed up the unreasonable upper limit recently?

The number of scheduler queue entries hasn't changed in any release of
z/VM that I'm aware of, so I doubt the TP:Omega number is in any real
hazard as the milestone for insanity. 

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