HP WebQoS Administration Guide

143
Glossary
A
admission control - A type of
access control that is focused on
protecting the system from
overload. Based on one or more
system load thresholds, it makes
decisions about what type of
requests to admit and which ones
to defer, redirect or reject.
C
class - See request classification
rule.
co-hosting - The sharing of a
server/cluster by several sites
whose contents are typically
owned and supplied by different
companies or business units.
Service isolation features within
the system and the web server
prevent different sites from
interfering with each other.
co-location - The sharing of a
physical premise by
servers/clusters each hosting a
different site, typically owned by
different companies or business
units. The businesses or business
units save money by having one
organization (Information
Technology or a service provider)
manage and maintain the
systems. The machines, however,
are considered to be owned by the
business or business unit.
concurrent sessions - The total
number of sessions that have not
expired (based on the
configuration of the advanced
features under “Session
Timeouts”) and are possibly
active. This number does not
indicate the total number of
sessions currently active on the
system.
corrective action - A set of one
or more actions that are invoked
when an SLO is violated. The set
of potential actions are intended
to alleviate the condition by
causing a lower priority SLO to be
violated, or by reducing load on
the system via session deferral or
rejection.
D
database - Stores configuration
and event information, statistics,
and component status. Resides on
only one system in your WebQoS
domain.
deferral - The postponement of
the servicing of a user request. A
deferral is performed by an
admission controller, typically in
response to heavy load on the
server. The request is given a time
slot at which it is expected that
the server will have enough
capacity to handle the entire
session.