Hello, I'm leaving this post here in case it's helpful to anyone. In my case I use the linuxserver docker, I've been investigating the reason. I knew it was something related to "nextcloud" because if I turned off the container, the disks spin down without any problem. Then I started looking for the reason why reading and writing was being done on my disks with the "inoitywait" command, because that was another problem, there were continuous writes that made my parity disk wake up too. Well, to sum it up, the culprit was the "collabora" container, since the last updates something must be wrong, now I've changed to onlyoffice and my disks are spinning down again.