Deployment Guide

HP Velocity Server Side Deployment Guide 68
Using the Management Application Configuration
Table 22. LiveQ configurable parameters
Configuration option Description
Global Target Loss Rate Specify the loss rate that HP Velocity will attempt to achieve for all active
HP Velocity-protected flows.
Available values are 0.04%, 0.1%, 0.2%, and 0.4%. The default is 0.04%.
NOTE: Aggressive target loss rates might not be achievable in very high-
loss networks or bandwidth restricted environments.
Congestion Avoidance Congestion Avoidance analyzes network links. It detects links with
bandwidth constraints and automatically adjusts HP Velocity protection to
accommodate the bandwidth constraint.
When Congestion Avoidance is active and bandwidth constraints are
detected, the bandwidth and default TLR settings described in this table are
overridden to ensure the best network performance possible.
Available values are enabled or disabled. The default value is enabled.
Bandwidth Control Specify the range of protection modes that HP Velocity is able to use when
encoding HP Velocity-protected flows.
The protection mode defines how protected flows are protected from
network loss. Higher protection modes protect against a greater network
loss but also require more bandwidth.
HP Velocity constantly monitors network loss and automatically selects the
protection mode required to reduce the network loss to the specified TLR.
The selection process is dynamic and the mode used at any given time
depends on the real-time loss measured in the network.
Available modes are:
• Dynamic: Use this mode in situations where bandwidth is not
constrained. It will maximize performance while minimizing the required
bandwidth. Dynamic is the default mode.
• Low: Use this mode in very bandwidth-constrained environments to cap
the estimated HP Velocity protection overhead at or below 27%.
• Medium: Use this mode in moderately bandwidth-constrained
environments to cap the estimated HP Velocity protection overhead at or
below 40%.
• High: Use this mode to maximize performance in environments where
bandwidth is not constrained and the network loss is known to be high.
This mode differs from the Dynamic mode in that it uses aggressive
encoding as soon as it detects HP Velocity at the far end, without first
measuring the loss in the network.