Just thought I'd let every know that I set up an iscsi target and used bcache and an ssd to speed things up. I came over from freenas and wanted to give this a try.
First I set up a raid array,
Setup Bcache as per this info https://www.tech-g.com/2017/08…-to-setup/#comment-346001
Setup Iscsi as per this info https://www.tecmint.com/setup-…nd-initiator-on-debian-9/
Unfortunately none of it shows in the gui, but it works fine. Running 6 VMs on a single raid 10 array.