100 lines
7.5 KiB
HTML
100 lines
7.5 KiB
HTML
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<meta name="abstract" content="If you are new to quality of service (QoS), you can read some basic QoS concepts. This will give you an overview of how QoS works and how QoS functions work together." />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Concepts</title>
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</head>
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<body id="rzak8what_is"><a name="rzak8what_is"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Concepts</h1>
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<div><p>If you are new to quality of service (QoS), you can read some basic
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QoS concepts. This will give you an overview of how QoS works and how QoS
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functions work together.</p>
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<p>Before attempting to do QoS, it is suggested that you research the topic
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and make sure that this service will meet your needs. QoS terms can be found
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in multiple sources, so this topic will only discuss the basic terminology.</p>
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<p>To carry out QoS, you configure policies using wizards in iSeries™ Navigator.
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A <em>policy</em> is a set of rules that designate an action. The policy basically
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states which client, application, and schedule (which you designate) must
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receive a particular service. You can ultimately configure three policy types:</p>
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<ul><li>Differentiated service</li>
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<li>Integrated service</li>
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<li>Inbound admission</li>
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</ul>
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<p><em>Differentiated service</em> and <em>integrated service</em> are considered
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outbound bandwidth policies. Outbound policies limit data leaving your network
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and help control server load. The rates you set within an outbound policy
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control how and what data is or is not limited within the server. Both outbound
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policy types might require a service-level agreement (SLA) with your Internet
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service provider (ISP).</p>
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<p><em>Inbound admission</em> policies control connection requests coming into
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your network from some outside source. Inbound policies are not dependent
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on a service-level from your ISP. To decide which policy you need to use,
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evaluate the reasons why you want to use QoS and consider the role of your iSeries server.</p>
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<p>One of the most important parts of carrying out QoS is your server itself.
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Not only do you need to understand the QoS concepts, but you also need to
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be aware of the role your server plays in these concepts. The iSeries server
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can only act as a client or a server, not a router. For example, an iSeries server
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acting as a client, can use differentiated service policies to ensure that
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information requests to other servers are given higher priority through the
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network. An iSeries server
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acting as a server, can use an inbound admission policy to limit Uniform Resource
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Identifier (URI) requests accepted by the server.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzak8diffserv.htm">Differentiated service</a></strong><br />
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This is the first type of outbound bandwidth policy you can create on your server. Differentiated service divides your traffic into classes. To carry out a differentiated service policy, you need to determine how you want to classify your network traffic and how to handle the different classes.</li>
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<li class="ulchildlink"><strong><a href="rzak8intserv.htm">Integrated service</a></strong><br />
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The second type of outbound bandwidth policy you can create is an integrated service policy. Integrated service provides the capability for IP applications to request and reserve bandwidth using the ReSerVation Protocol (RSVP) and quality of service (QoS) APIs.</li>
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<li class="ulchildlink"><strong><a href="rzak8inbound.htm">Inbound admission policy</a></strong><br />
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The inbound admission policy is used to control connection requests coming into your network.</li>
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<li class="ulchildlink"><strong><a href="rzak8cos.htm">Class of service</a></strong><br />
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When you create a differentiated service policy or an inbound admission policy, you also create and use a class of service.</li>
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<li class="ulchildlink"><strong><a href="rzak8rsvp.htm">QoS APIs</a></strong><br />
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You can read this topic to learn about protocols, APIs, and requirements for a router that is enabled for the ReSerVation Protocol (RSVP). The current quality of service (QoS) APIs include the RAPI API, the qtoq socket API, the sendmsg() API, and the monitor APIs.</li>
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<li class="ulchildlink"><strong><a href="rzak8ldap.htm">Directory server</a></strong><br />
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You can export your policies to a directory server. Read this topic to see the advantages of using or not using a directory server, Lightweight Directory Access Protocol (LDAP) concepts and configuration, as well as the quality of service (QoS) schema.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzak8kickoff.htm" title="The iSeries quality of service (QoS) solution enables policies to request network priority and bandwidth for TCP/IP applications throughout the network.">Quality of service</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzak8sla.htm" title="This topic points out some of the important aspects of a service-level agreement (SLA) that might affect your quality of service (QoS) implementation.">Service-level agreement</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzak8other_info.htm" title="Listed here are the IBM Redbooks (in PDF format), Web sites, and information center topics that relate to the quality of service (QoS) topic. You can view or print any of the PDFs.">Related information for QoS</a></div>
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</div>
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</div>
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</body>
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</html>
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