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A lot of them genuinely ran Mac OS Server back when that was a thing. Probably some that still run macOS, but now most probably just run Linux.
I ran a cluster of XServes back in the day. Probably some of the most well engineered hardware I had seen since Solaris Sparc’s in the 90’s. That said, the software stack didn’t perform well. Ever. Way too much overhead.
Linux, just like Microsoft’s.
Just like every other cloud.


