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145 lines
7.7 KiB
XML
145 lines
7.7 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
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%BOOK_ENTITIES;
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]>
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<!-- Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<section id="network-rate">
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<title>Network Throttling</title>
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<para>Network throttling is the process of controlling the network access and bandwidth usage
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based on certain rules. &PRODUCT; controls this behaviour of the guest networks in the cloud by
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using the network rate parameter. This parameter is defined as the default data transfer rate in
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Mbps (Megabits Per Second) allowed in a guest network. It defines the upper limits for network
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utilization. If the current utilization is below the allowed upper limits, access is granted,
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else revoked.</para>
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<para>You can throttle the network bandwidth either to control the usage above a certain limit for
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some accounts, or to control network congestion in a large cloud environment. The network rate
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for your cloud can be configured on the following:</para>
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<itemizedlist>
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<listitem>
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<para>Network Offering</para>
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</listitem>
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<listitem>
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<para>Service Offering</para>
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</listitem>
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<listitem>
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<para>Global parameter</para>
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</listitem>
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</itemizedlist>
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<para>If network rate is set to NULL in service offering, the value provided in the
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vm.network.throttling.rate global parameter is applied. If the value is set to NULL for network
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offering, the value provided in the network.throttling.rate global parameter is
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considered.</para>
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<para>For the default public, storage, and management networks, network rate is set to 0. This
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implies that the public, storage, and management networks will have unlimited bandwidth by
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default. For default guest networks, network rate is set to NULL. In this case, network rate is
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defaulted to the global parameter value.</para>
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<para>The following table gives you an overview of how network rate is applied on different types
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of networks in &PRODUCT;.</para>
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<informaltable>
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<tgroup cols="2" align="left" colsep="1" rowsep="1">
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<colspec colwidth="1.0*" colname="1" colnum="1"/>
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<colspec colwidth="3.18*" colname="2" colnum="2"/>
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<thead>
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<row>
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<entry><para>Networks</para></entry>
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<entry><para>Network Rate Is Taken from</para></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><para>Guest network of Virtual Router</para></entry>
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<entry><para>Guest Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Public network of Virtual Router</para></entry>
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<entry><para>Guest Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Storage network of Secondary Storage VM</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Management network of Secondary Storage VM</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Storage network of Console Proxy VM</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Management network of Console Proxy VM</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Storage network of Virtual Router</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Management network of Virtual Router</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Public network of Secondary Storage VM</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Public network of Console Proxy VM</para></entry>
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<entry><para>System Network Offering</para></entry>
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</row>
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<row>
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<entry><para>Default network of a guest VM</para></entry>
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<entry><para>Compute Offering</para></entry>
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</row>
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<row>
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<entry><para>Additional networks of a guest VM</para></entry>
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<entry><para>Corresponding Network Offerings</para></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>A guest VM must have a default network, and can also have many additional networks.
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Depending on various parameters, such as the host and virtual switch used, you can observe a
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difference in the network rate in your cloud. For example, on a VMware host the actual network
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rate varies based on where they are configured (compute offering, network offering, or both);
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the network type (shared or isolated); and traffic direction (ingress or egress). </para>
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<para>The network rate set for a network offering used by a particular network in &PRODUCT; is
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used for the traffic shaping policy of a port group, for example: port group A, for that
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network: a particular subnet or VLAN on the actual network. The virtual routers for that network
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connects to the port group A, and by default instances in that network connects to this port
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group. However, if an instance is deployed with a compute offering with the network rate set,
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and if this rate is used for the traffic shaping policy of another port group for the network,
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for example port group B, then instances using this compute offering are connected to the port
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group B, instead of connecting to port group A.</para>
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<para>The traffic shaping policy on standard port groups in VMware only applies to the egress
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traffic, and the net effect depends on the type of network used in &PRODUCT;. In shared
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networks, ingress traffic is unlimited for &PRODUCT;, and egress traffic is limited to the rate
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that applies to the port group used by the instance if any. If the compute offering has a
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network rate configured, this rate applies to the egress traffic, otherwise the network rate set
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for the network offering applies. For isolated networks, the network rate set for the network
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offering, if any, effectively applies to the ingress traffic. This is mainly because the network
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rate set for the network offering applies to the egress traffic from the virtual router to the
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instance. The egress traffic is limited by the rate that applies to the port group used by the
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instance if any, similar to shared networks. </para>
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<para>For example:</para>
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<para>Network rate of network offering = 10 Mbps</para>
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<para>Network rate of compute offering = 200 Mbps</para>
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<para>In shared networks, ingress traffic will not be limited for &PRODUCT;, while egress traffic
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will be limited to 200 Mbps. In an isolated network, ingress traffic will be limited to 10 Mbps
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and egress to 200 Mbps.</para>
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</section>
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