chu-diagnostics-20181113-1312.zip

 

Don't know whether to send this drive back to get another replacement, or format it once again as new drive, before adding it back to array.

Edited November 13, 20187 yr by jang430

Disk looks fine, replace or swap cables to rule them out and rebuild to the same disk.

Thanks!

After swapping the sata cable with another working drive (to isolate), I powered on the nas.  I stopped the array, and selected no device in it's place.  The drive was delegated to unassigned.  I started the array.  I stopped the array once again, tried to select the drive and reassign it back in it's place without formatting or preclearing the drive.  I cannot reassign it since it's not in the selection.  Instead, I get this error message when I click on disk log information under unassigned drives, I captured it in screenshot.

 

Edited November 13, 20187 yr by jang430

You should also replace/swap the power cable, if still issues then it's likely the disk despite the healthy looking SMART.

noted.  For a second, the drive was assignable under it's old position, disk5.  In a few seconds, it vanished, and was not even seen on unassigned drive.  Will try swap the power cable with the same drive where I got the sata cable from.  If the problem transferred there, it should be power cable issue.  If it stayed with this drive, then it's the drive's problem.  

 

Do I need to preclear or format, or delete it's existing partition when I temporarily assign it to unassigned drive?  Not that I want to, but want to make sure when I reassign it to the array, it will start rebuilding.

2 minutes ago, jang430 said:

Do I need to preclear or format, or delete it's existing partition when I temporarily assign it to unassigned drive?

No, you just need to re-assign it to begin the rebuild.

So, the power cable where the drive was having problems, I moved it to a working drive, and now, the working drive is missing.  I guess that's it.  Thanks @johnnie.black