VMware vSphere Network I/O Control (NIOC) definition

This definition is part of our Essential Guide: Stay connected with tips and trends in vSphere networking
Contributor(s): Ryan Lanigan

VMware vSphere Network I/O Control (NIOC) is a feature that allows an administrator to prioritize bandwidth for different network resource pools on a vNetwork Distributed Switch (vDS).

When enabled, Network NIOC categorizes traffic into network resource pools, which use resource allocation policies to control bandwidth for various traffic types. By default, a shares value of 50 is given to each pool, except for VM traffic, which gets a default of 100. The administrator can adjust the shares value to each pool to determine how much bandwidth a pool gets to fulfill specific service levels. Pools with a higher shares number receive more physical network resources. 

NIOC resource pools include:

Network NIOC was first introduced with vSphere 4.1. 

This was first published in July 2014

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