So, let's say your server had 6 healthy hard drives. A drive fails (will not mount/detect, drops out of raid with errors) or is failing (SMART getting worse, etc). You need to swap out the bad drive. When you open the case you see.. six identical hard drives.
How can you tell which one is no longer healthy/mounting/functioning?
System would be linux, most likely ubuntu server, using at most simple software RAID. The hard drives would be SATA and connected directly to the motherboard. (no raid controller)
I don't want to randomly disconnect drives until I pick the correct one. The drives all appear identical to me; I imagine there is some common way to identify which drive is which that I am unaware of. Does anyone have any pointers/tips/best practices? Thanks!
EDIT: I had wanted this to be 'generalized' in a hand-wavy sort of way, but it just came off as 'incomplete' and 'horrible'. My bad!