cannot import <pool> pool was previously in use from another system

[ghost]

Hi there,

I have an encrypted root pool that I encrypt with a password during boot. I also have another second encrypted pool on the computer. I have setup a systemd service that runs zfs load-key -a and zfs mount -a to mount the second pool after the computer has started.

However during boot I always get the error message cannot import <pool> pool was previously in use from another system. It seems that this way of doing things is not intended. What would be the correct way to set this up without provoking the aforementioned error message?

Thank you all!