VMware vSphere 6.x Datacenter Design Cookbook by Hersey Cartwright

Author:Hersey Cartwright
Language: eng
Format: epub
Publisher: Packt Publishing

Shares define the share a specific traffic type will receive from the available bandwidth on a physical NIC attached to the vDSwitch at the time of network bandwidth contention. Reservation is the Mbps guaranteed to a specific traffic type. Limit is the Mbps limit applied to all hosts connected to the vDSwitch.

The percentage of bandwidth a traffic type receives is based on the total number of shares available; for example, in the default configuration, the virtual machine traffic receives 100 shares of the 400 (50 + 50 + 50 + 50 + 100 + 50 + 50) shares available. The formula for this is as follows:

Shares Value / Total Available Shares = Percentage of Physical Network Bandwidth

Therefore, 100 / 400 = 25%.

The amount of bandwidth available to vMotion would be calculated based on the 50 shares allocated to the vMotion traffic, as follows:

50 / 400 = 12.5%

Network resource pools can be created in order to allocate virtual machine traffic reservations across distributed port groups. For example, if 100 Mbps is reserved for virtual machine traffic, this reservation can be applied across different port groups. In the following screenshot, New Network Resource Pool is created, allocating 90 Mbps of the 100 Mbps reservation to a pool named CriticalVMs:

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