I can’t tell what your experience level is with ZFS so I am posting the following. You will have to consider your performance, storage expansion plans and decide on pool and VDEV layouts.
BASICS
iX Systems pool layout whitepaper
Special VDEV (sVDEV) Planning, Sizing, and Considerations
And a link to the Hardware Guide on the old forums. You can download a PDF using the yellow Download button on the upper right side.
