I'm not sure how common it is, but I met a guy who uses a CD drive to identify the unit he is searching for. Pops them out remotely. Of course it is applicable only if your servers have CD drives, but it's hell of a lot easier than spotting LED patterns.

What a great read, I enjoyed that.

That's the 2007 internet :-). Mourning...

Ah, back in university early 2000s we used that to identify computers in the it rooms and their 50+ laptop next to each other’s.

another similar post: http://dtrace.org/blogs/rm/2019/08/14/cpu-and-pch-temperatur...

I rarely comment about site design, but this is illegible on mobile screens and it's an interesting story so worth sharing. Just setting the width of the main content to ~65em would make it legible upon element zoom for a lot of devices.