But, surely Windows is the wrong OS?
Oh yes! To be clear - trying to put any version of Windows on a super-computer is every bit as insane as you might imagine. By what I heard in the rumor mill, it went every bit as badly as anyone might have guessed.
But I like to root for an underdog, and it was neat to hear about Microsoft engineers trying to take the Windows kernel somewhere it had no rational excuse to run, perhaps by sheer force of will and hard work.
I dont know of anywhere that Microsoft confirms, officially, that Azure, itself, is largely running on Linux. They share stats about what workloads others are running on it, but not, to my knowledge, about what it is composed of.
I suppose that would be an oversimplification, anyway.
But that Azure itself is running mostly on Linux is an open secret among folks who spend time chatting with engineers who have worked on the framework of the Azure cloud.
When I have chatted with them, Azure cloud engineers have displayed huge amouts of Linux experience while they sometimes needed to “phone a friend” to answer Windows server edition questions.
For a variety of reasons related to how much longer people have been scaling Linux clusters, than Windows servers, this isn’t particularly shocking.