There isn’t a lot of documentation on debugging SAS-specific storage problems under Linux, unfortunately. I’ve had a couple issue recently that were tied to flaky SAS cables and mostly had to debug them through swapping cables and logic to figure out which device was causing issues. Along the way I’ve learned a few helpful things. First, Linux actually has counters for tracking SAS-level problems. They’re just really hard to find, and very few tools expose them. The kernel would love ...
