HP WebQoS Administration Guide

Understanding HP WebQoS
The Role and Benefits of HP WebQoS
Chapter 114
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.