Hanswurst

No - it's not an unassigned device. I just tried to spin down the disk via terminal with hdparm and it works flawlessly. Both, standby -y and sleep -Y spin down the disk immediately root@MyUnraid:/dev# hdparm -y /dev/sdb /dev/sdb: issuing standby command SG_IO: bad/missing sense data, sb[]: f0 00 01 00 50 40 00 0a 00 00 00 00 00 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

I have more or less the same setup and I'm experiencing exactly the same issue. I have a 512GB SSD as cache and a 5TB external USB HDD. No VM running. Appdata, domains, system on cache Only one Share with plain data on the HDD array - No spindown of the USB HDD possible automated or manually - I can even spin down the cache for a few seconds till file access, but ext. HDD does not spin down at all - Stopped all dockers, disabled Docker and VM in Settings - Checked with file activity plugin and could not see any activity there - Multiple reboots The USB drive just does not spin down. I wanted to learn a bit about Unraid and planned switching and 4 more harddisks were planned to be added in the final setup. But as this is still a personal server that will be untouched 90% of the day having 5 disks running 24/7 is just a NoGo and I'm already trying to find a solution for days without any luck.