HP WebQoS Software manual WebQoS Concepts, Service, Request Classifications, Sessions

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Understanding HP WebQoS

The Role and Benefits of HP WebQoS

WebQoS Concepts

This section describes fundamental WebQoS concepts and capabilities. Understanding these concepts is necessary before you can understand how WebQoS technology works.

Service

A service refers to something of value that a business is offering to other businesses or consumers. For example, a business may provide email, messaging, documentation publishing, cataloging, and Electronic Commerce services. A WebQoS service is a way to logically group web sites related to a business application that you offer to customers or partners.

Request Classifications

Request classifications determine access priority for requests submitted to a web site. They enable you to give preferential treatment to your most important customers or transactions, allowing you to meet formal or informal service level agreements.

WebQoS request classifications differentiate requests as they enter the server system by dividing requests into categories based on application, client or destination IP addresses, destination port number, and URL document paths. These request classifications can be assigned different priority levels.

WebQoS supports three request classification priority levels: high, medium, and low. During periods of heavy system load high priority requests can be given preferred access to the server and low priority requests can be redirected or rejected. If a request is accepted, it is scheduled based on its request classification priority. Based on your configured policies, the request might be immediately processed, or it may wait while higher priority requests are processed first.

Sessions

A session is composed of one or more requests to a web site from the same user. These requests may arrive over one, or over several connections. Once a session has been granted access to a web site, a user's remaining requests are guaranteed to be forwarded to the web server, unless the session times out.

Under periods of heavy system load, new sessions may not be granted.

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Contents Edition E0801Legal Notices Contents Services, Sites, and Systems Troubleshooting Policy and Rule Descriptions Synopsis Arguments Return Value Sample Program Contents Printing History Page Understanding HP WebQoS Role and Benefits of HP WebQoS Role and Benefits of HP WebQoS Request Classifications ServiceWebQoS Concepts SessionsCapacity Protection SLOs, Thresholds, and Corrective ActionsRole and Benefits of HP WebQoS How WebQoS Fits Into Your Environment WebQoS in Your EnvironmentWebQoS Components WebQoS ComponentsWeb Services Component Installed On Description ManagementSCA Service SCI ServiceHow WebQoS Fits Into Your Environment Chapter Setup WebQoS Software Installation WebQoS Configuration FilesSCA and Web Server Parameter Web Server ParametersDefault HTTP/1.1 MonitorInterval seconds SCA Parameters SCO Parameters Logging and Tracing Parameters Unix Only URL Encoding Parameters Restarting WebQoS Components Unix WebQoS setup Script UnixRestarting Individual WebQoS Components Restarting WebQoS Components WindowsSingle Server Setup Continue? Multiple Server Setup Server 1 Setup Servers 2 and 4 Setup Server 3 Setup Opt/webqos/install/setup -r Removing WebQoSWebQoS setup Script Unix Chapter Management Console Management Console Login WebQoS Login Dialog BoxWindow Area Description Console Main ScreenManagement Console Main Screen Console Main Screen Services/Systems View Auto DiscoveryConsole Administration PasswordDomain Management Console Administration Chapter Templates Preconfigured Templates Preconfigured and Default TemplatesDefault Templates Service Template DescriptionService Statistics For the service templateService Template Statistics StatisticsURL Group Statistics Service Template SLOs SLOsAdd/Edit Service Level Objectives Add/Edit SLOsAdd/Edit Corrective Actions Service Template Advanced AdvancedDefer Defer Corrective ActionRedirect Redirect Corrective ActionReject Reject Corrective ActionSite Template 10 Site Template DescriptionClassification Rules 11 Site Template Classification RulesAdd/Edit Classification Rules 12 Add/Edit Request Classifications Rules13 Site Template SLOs Add/Edit SLOs 15Add/Edit Corrective Actions Threshold Policies 16 Site Template Threshold PoliciesAdd/Edit Threshold Policies 17 Add Thresholds Dialog Box18Add/Edit Corrective Actions 19 Edit Site Configuration Advanced Dialog Box Session Timeouts 20 Site Advanced Session Timeouts Dialog BoxWeb Server Accept Threads Corrective Action Policy Details22 Defer Corrective Action 23 Redirect Corrective Action 24 Reject Corrective Action Site Statistics 25 Site Template StatisticsSite Template Site Template Chapter Services, Sites, and Systems Edit a Service ServicesAdd a Service Move a ServiceDelete a Service Edit a Site SitesAdd a Site Move a SiteIPlanet Web Server Delete a SiteMicrosoft IIS Starting and Stopping IISDelete a System SystemsAdd a System Systems Systems Chapter Statistics Service Statistics Service SLO Related StatisticsService SLO Related Statistics Service Session Control Statistics Service Session Control StatisticsService Defer Related Statistics Service Defer Related StatisticsSite Statistics Site StatisticsSite SLO Related Statistics Site SLO Related StatisticsSite Session Control Statistics Site Session Control StatisticsSite Statistics Site Statistics Chapter Logs and Filters SLOs, Thresholds, and the History Log Service Level Objectives ViewService Level Objectives View SLOs, Thresholds, and the History Log History Log View History Log View SLO and Threshold Filters SLO and Threshold FiltersSLO Filters History Log Filter History Filters DialogChapter 103 Site Measurements Service and Site StatisticsOpenView Logs Policy and Corrective Action Events Field Values Chapter 107 108 Troubleshooting Shared Memory Troubleshooting on UnixManagement Console Error Messages Error Logging and Tracing Measurement Logging LoggingTracing Statistics LoggingChapter 113 Resetting the Management Console Password Troubleshooting on WindowsProblems with Shared Memory Error Messages Viewable From the Management Console Logging and Tracing Registry Editor Window for WebQoS Deleting WebQoS Log and Trace Files118 Policy and Rule Descriptions Request Classification Rules Appendix a 121 Service Level Objectives for Site Policies Set in WebQoSService Level Objectives for the Service Threshold Policy Corrective Actions for SLO and Threshold Policy ViolationsCustomizing the Defer and Reject Web Pages 126 Appendix a 127 Request to be retried see Figure A-2 Figure A-2 Example of Custom Defer Page with LinkAppendix a 129 Expired see Figure A-3 Figure A-3 Example of Custom Defer Page with Popup DialogAppendix a 131 132 External Measurement API Using the External Measurement API Appendix B 135 Arguments WqCreateConnectionSynopsis Return ValueWqSendMeasurement Values in the following formatReturn Values Status WqCloseConnection Connection with WebQoS has been closedSample Program Appendix B 141 142 Glossary Class See request classification rule144 145 146 Index 148 149 150
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