I would just like to make you aware of a cool patchset:
You can also grab it from my kernel: Files · torvic-5.14-ledtrig · torvic9 / Linux Stable · GitLab
This is super useful for computers that do not have a dedicated hard drive activity LED:
I've just tested this by putting the activity LED to my CapsLock LED, and it works! And, dare I say, it's freakin' awesome
(blinking intervals and duration can be configured)
And you can add any block device to any recognized LED on your computer.
If I were talented I would try to build a microcontroller having LEDs for every device including swap. Avis aux amateurs!