It seems like me and you spider isn't on the same page here... Let me explaine:
If I were to make a second pool using my Archive drives, this would act as a backup pool only. No duplication within the pool it's self but some sort of syncronization between the first and second pool(as far as I know it's not possible to apply duplication across pools). The reason for this is that the drives are Seagate's Archive 8TB and should ONLY be used as a Cold Storage, NOT for general usage which excludes storing files that are expected to be changed or deleted (jpg txt nfo etc) on the drives.
If I were to use the second pool With Kodi, it would not be possible to use "nfo files only" for my Library, and because of this Kodi's library would not look like I want it to. I know there are other ways of using nfo files but for me it's not an alternative.
I hope you now understand why my pool is set up the way it is.
Another issue I would like to address is that there's no detailed report from DP that can guide us when problems With the balancing occur. It would be much easier to fix things ourselves if we knew the reason for why things happen the way they do.
In my situation it would be great if DP could tell me why it can not move iso's to my Archive drives instead of telling me there's not enough free Space in the pool, which is not correct.