Based on shares, reservation, and limit, you can configure Network I/O Control to allocate certain amount of bandwidth for traffic generated by vSphere Fault Tolerance, iSCSI storage, vSphere vMotion, and so on.

You can use Network I/O Control on a distributed switch to configure bandwidth allocation for the traffic that is related to the main system features in vSphere:

Management

Fault Tolerance

iSCSI

NFS

Virtual SAN

vMotion

vSphere Replication

vSphere Data Protection Backup

Virtual machine

vCenter Server propagates the allocation from the distributed switch to each physical adapter on the hosts that are connected to the switch.

By using several configuration parameters Network I/O Control allocates bandwidth to traffic from basic vSphere system features.

The capacity of the physical adapters determines the bandwidth that you guarantee. According to this capacity, you can guarantee minimum bandwidth to a system feature for its optimal operation.

Assign bandwidth for host management, virtual machines, iSCSI storage, NFS storage, vSphere vMotion, vSphere Fault Tolerance, Virtual SAN, and vSphere Replication on the physical adapters that are connected to a vSphere Distributed Switch.