All my drives came with a sticker from WD with the serial number on the back of each drive. I am able to open my hot swap bays just enough to the number without disconnecting the drives.
Once my server was up and running I took a snapshot of all of the drives, shut off the server, and rearranged them from top to bottom following the order on the list. So disk 1 is in slot 1 and so on.
All my drives came with a sticker from WD with the serial number on the back of each drive. I am able to open my hot swap bays just enough to the number without disconnecting the drives.
Once my server was up and running I took a snapshot of all of the drives, shut off the server, and rearranged them from top to bottom following the order on the list. So disk 1 is in slot 1 and so on.