D-Link DSN-6020 User Manual page 27

2. In addition, installing an iSNS server is recommended for dual controller system.
Power on the DSN-6410 or DSN-6410w/DSN-640 and the DSN-6020 (optional)
3.
first, and then power on hosts and iSNS server.
4. Host server is suggested to logon the target twice (both controller 1 and controller 2),
and then MPIO should be setup automatically. (only for DSN-6410 with DSN-640)
Tips
iSNS server is recommended for dual controller system.
For better data service availability, all the connections among host servers, 10GbE
switches, and the dual controllers are recommended as redundant as below.
The following topology is the connections for console and UPS (optional).
Figure 2.5.3 (only for DSN-6410 with DSN-640)
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