Dell PowerVault NX3500 Administrator's Manual page 36

Dedicated SAN Solution in the Non-Redundant Option
The second configuration option is to isolate the SAN traffic from the client
traffic, but without redundant switches. All the client cables are connected to
the client switch and the SAN or internal network cables are connected to the
SAN switch. Peer connections are always back to back.
In this configuration, the switches become a single point of failure. It is
recommended that you separate the SAN subnets using virtual LANs.
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Setting Up Your PowerVault NX3500 Solution