organise files and services to allow spin down.

i have been looking at my electricity usage and i would like to see whats potentially possible to do with my unraid box in terms of spinning down disks. 

I saw a reddit post where someone had organised files specifically so that their current (past 2 years) files were on a couple of SSD's and then anything older than that was on one of two spinning disks. which then allowed them to spin down when not in use. saving them about 35W ish

i have been planning to rebuild my unraid system into a new box and when i do that i would like to try and organise things in some sort of sensible fashion to do the same. 

i think my main potential issue is i dl quite a few Linux ISO's each month of both types so i continually have new content being added. 

I guess what im asking is. are there any good maintenance scripts or user scripts that could auto move anything that has not been accessed for X amount of time to some specified hard drives. 

i know some of you have the "dont do that it wears out the disk" approach which i appreciate. but considering i spend around £10 a day on electric and that is closer to £3 a day when the unraid server isn't on. i could just buy new hard drives if they fail. 

What is your approach to this? if you do it. 

or any pointers or further reading on the subject? 

i know from past support requests that my docker containers are not sitting on a cache drive so thats one step i could amke as currently i think everything is just set as low tide. 

i never really gave it a thought when setting it all up. but now im at about 90TB with another 14TB disk to go in total of 10 disks currently. and that will be growing at some point soon. 

enough rambling. 

Whats the optimal setup for disks and caches for a media server with a pile of docker containers. and some data related to work .

power saving first and foremost. performance is fine as is but could always do with more. so whats the optimal setup for performance also?

Thanks in advance.