The DS1623xs+ scales to 30+ bays with DX1222 expansion units
Up to two DX1222 expansion units add 12 bays each over eSATA, and the PCIe 3.0 x8 slot can take a 10GbE card or M.2 NVMe adapter.
Up to two DX1222 expansion units add 12 bays each over eSATA, and the PCIe 3.0 x8 slot can take a 10GbE card or M.2 NVMe adapter.