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Parallels Infrastructure Manager displays the current status and statistics of network traffic on the Hardware Node. The screen is displayed on the Traffic subtab of the Network tab of a Hardware Node.
Traffic accounting is always enabled in the Virtuozzo Containers software, i.e. you can always view the statistics on the network traffic going from and to the Hardware Node for each of the network classes specified in the system. The statistics is garnered from the moment of the latest Node boot-up and is displayed in the Traffic Accounting table.
The conception of traffic shaping presupposes the limitation of network bandwidth for the traffic going from the Node to the outer world. The Interfaces Configuration table enumerates the network interfaces (Ethernet cards) installed on the Node and their bandwidth limit. The most common Fast Ethernet cards have their traffic throughput limited at 100 Mbit/s, which would be indicated in the Bandwidth column as 102,400 Kbit/s.
The Virtuozzo Containers software can limit the network bandwidth not for the interface, but for each network class defined in the system and using the given interface. For this reason, the available network classes will be enumerated under each of the existing interfaces in the Rates Configuration table. The Total Rate column specifies the size of the so-called bandwidth pool for each network class being shaped for the given network adapter. The bandwidth from the pool can be borrowed by Containers when they need more bandwidth for communicating with hosts from the corresponding network class. It is used to limit the total available outgoing traffic Containers can consume; the Managing Network Shaping for Single Container subsection explains it in more detail. The default value for Network Class 1 on the first Ethernet adapter is 4Mbit/s.
As to the Rate Guarantee column, its value amounts to the number of kilobits per second any Container is guaranteed to receive for outgoing traffic with the corresponding network class on the given Ethernet device. The default value is 8 Kbps, which means that any Container is guaranteed to receive the bandwidth of at least 8 Kbits/s for sending data to Class 1 hosts on the first Ethernet device. This bandwidth is not the limit for a Container (though it is possible to make it the limit) - the Container is able to take the needed bandwidth from the bandwidth pool if it is not used by other Containers.
Apart from viewing the current state of affairs with the Node traffic, the Traffic subtab allows you to do the following:
Specify the bandwidth limit for the existing network interface cards by clicking the Configure Interfaces button;Note: You can enable shaping only if you have already completed the first three actions on this list, namely: defined at least one network class, specified the bandwidth limit for the existing NICs, and configured the outgoing traffic rates for each 'interface-class' pair.
