Upon initial configuration of your cluster, OneFS creates an initial internal network for the InfiniBand switch. The interface to the default internal network is int-a. An internal network for a second InfiniBand switch can be added for redundancy and failover. Failover allows continuous connectivity during path failures. The interface to the secondary internal network is int-b, which is referred to as int-b/failover in the web administration interface.
Only Isilon nodes should be connected to your InfiniBand switch. Information exchanged on the back-end network is not encrypted. Connecting anything other than Isilon nodes to the InfiniBand switch creates a security risk.