The original post: /r/datahoarder by /u/xxpor on 2024-06-04 14:07:59.
My DS4246 came from ebay with the standard 2 PSU/2 Blank slot setup. I have the left side of the shelf totally full, and the right side partially full, but mostly empty. The drives on the right side were sitting around 45c, but the drives on the left side hit 67c (!!!!). I thought the drive sensors might be lying, since they were so high. I took a closer look at the empty slots and realized that the airflow that the PSUs were moving were likely coming mostly from the back of the unit since that's a path of less resistance than flowing over the drives themselves.
I printed 2 of these guys: https://www.thingiverse.com/thing:6514452. I stuck them in the slots, and within 10 seconds the fans spun way up and started moving serious air. Now the drives are all around 35-42c, totally normal!
So if you have a NetApp disk shelf, check your drive temps and make sure you block every open port. There's also an STL available to blank off IOM slots if you need it under the netapp category. Of course, they're available to buy as well.