Same disk missing after cold boot.

[TyantA]

Curious. I've been "dealing" with this for some time. 

 

Whenever we're away, I power down the server. When I get back, without fail, my disk 1 shows up as missing. (WD Red 4TB) Until recently, I'd reboot 2-3 times and it would usually come back, work as normal and I'd forget about it. 

 

Just started it up after being away last night and same issue, but this time it didn't seem to want to be detected no matter how many times I wiggled / re-seated the cables and rebooted. 

 

Finally, I pulled all the disks until I could find the culprit so I knew which one I was dealing with. It's one of the drives on my controller card and I recently installed new cables for said card. I swapped it with a cable from my motherboard and it booted with all disks detected. 

 

So... it seems like it was just how that cable/controller was interacting with that particular drive? At the moment it's working but who knows if it will continue or not. If it were an issue with the cable / controller, you'd think my parity drive (cable I swapped with) would have shown similar symptoms. 

 

So far so good. Any ideas about what might be going on?