The jbod idea sounds good to explore further, as it tha home server and storage would be separated. However it would add an additional device to the power bill.
However i don’t need the full amount of all disks at all times. If i’d want to unplug via shell script, i’d need to plug it manually in person back in for storing things. I actually do not need it running all the time, as the home server ssd can cache most of what i need recently in access. The jbod is then more an archive.
i’m mainly looking for a way to power down the inexpensive hdd’s. I could use the raspberry pi as the jbod controller, but it does not properly support wake on lan, so thats also not an option