FreeNAS Mini - best uses for extra storage devices?

Hi all, I just recently purchased a used FreeNAS Mini with 4x 4TB HDDs, as well as the optional L2ARC and ZIL SSDs installed. In my particular case, I chose to create two striped VDEVs and then mirror the two VDEVs (basically RAID10) as it was more practical for my usage, so now I have some extra SSD storage and I'm not quite sure what to do with it.



My first question: what is ada2? It looks like it might be the disk the OS would be installed on but I'm...

FreeNAS Mini - best uses for extra storage devices?