Or is there any way to "thin the herd" and merge regions to spread the load,
Oh yes, no problem at all.
In zone 2 we've managed several such mergers. One such was the merger of R20, R21, R22 and R23 into R20. The merger went without any problems (AFAIK). All it takes is the cooperation with the RCs and their ZC. And that's only the latest here.
And now over to zone 1, and how they have managed to reduce the number of regions from ten (with 25,000 nodes 20 years ago) to ten with a couple of hundreds now. 8-)
Yeah, I know, those Mickey Mouse hats *do* sit nicely...
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