In pictures: Taking apart D-Link's xStack DSN-2100...
The four host Gigabit Ethernet connections support IEEE 802.3ad Link Aggregation Groups (LAG), which groups the four ports for a total bandwidth of 425 megabytes per second. The ports support full offloading capability. The LAG support provides maximum throughput for iSCSI commands as well as increased redundancy protection.
In pictures: Taking apart D-Link's xStack DSN-2100-10 SAN array