I run a supermicro chassis with 6 3TB drives in a RAID6 using a dedicated hardware RAID controller. Old school for these days but works for my needs for now. Drives were free from a buddy of mine so until they start dying or I need more space, they'll do. Then I have two 120GB intel enterprise SSDs for running Proxmox. VMs and LXCs are all on the spinning disks which surprisingly perform well enough.