Thanks Scott and Thomas for responding to this.
We have nine SATA shelves (four on node 1, five on node 2) and 13 SAS shelves (seven/six). Everything's in production use, so I'm not about to try to split them up between nodes at this point, but we do have enough SAS spares to create a new root aggr on them and move vol0. What I want to know is WHY this would be needed. I'm perfectly willing to do it, mostly because I trust my VAR but also because it fits in with some other improvements we're making, but I thought I'd see what the NetApp Community thinking on this was.
Thomas, you mention that one possible reason would be to have the best performance possible, but I guess I'd like to know just how much performance vol0 needs and why you think it would need the best. Obviously, we've not had any performance issues as yet, but I'd like to have some background on this in case i'm asked 😉