Let me take this one I am the Tim stephen is talking about
It is two Ebox m’s with a 16 channel hardware raid controller card installed. Sam at DatOptic spent a lot of time working with me to customize this set up. The drives are wired via 4 mini sas cables. The one drawback is the controller card has internal connections so we had to us up one card space for a adapter to go from the internal sas to external sas wiring. This does take up a lot of room in the card bay but no additional lanes.
We did let DatOptic supply the drives. They run them through to make sure there are not bad sectors and built the raid so it is ready to go for you. When dealing with 16T it does take a while to build (about 6 hours). We could have bypassed this as we decided to test a few different set ups before for speed. We settled on Raid 6 with a hot spare.