Just Friday I had the weirdest thing happen. One of my EARX drives was a sleep and I hot unplugged it by mistake. I was being stupid in a rush. But it was asleep so I thought no harm no foul..... Well I was wrong I placed it in the server and started a rebuild and in a few seconds puff it would fall off. So I started a pre-clear and it would finish pre-read start zeroing and puff fall off with buffer over runs. ? So I tried again and again same thing when I try to write to the drive puff no connection. So I connected it to my windows and ran a low level format at first to delete the mbr incase of corruption. Same when on Unraid so finally as a last resort I did a full low level format slow and painful. It finished correctly in windows!  So finally I ran a final pre clear and so far I am on post read 75%. This was the weirdest drive ever. By the way smart tests pass. So I guess it had something to do with the hot unplug. Please be warned.   

You are only suppose to hotswap drives when the array is stopped, and to my knowledge no drives spin down or go into sleep when the array is stopped. Unplugging drives with the array running will cause problems, and the system will assume you had a disk failure.

 

I'm glad you got it working. I don't think people go around unplugging their drives with the array running though. 

Yes yes but what I wanted to tell people is that the drive went AWOL. I think it would have had this problem even if I would have stopped the array. Because as far as I could tell drive was bad with good smart.

 

Thank you.