Manual Chapter :
Investigating Server Latency Issues
Applies To:
Show VersionsBIG-IP AAM
- 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
BIG-IP APM
- 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
BIG-IP Analytics
- 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
BIG-IP LTM
- 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
BIG-IP AFM
- 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
BIG-IP PEM
- 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
BIG-IP DNS
- 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
BIG-IP ASM
- 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0
Investigating Server Latency Issues
Overview: Investigating server latency issues
This implementation describes how to investigate server latency on the BIG-IP® system. You can investigate server latency issues on the Analytics charts when Application Visibility and Reporting (AVR) is provisioned.
Investigating the server latency of applications
Before you can investigate server latency, you need to have created an HTTP
Analytics profile that is logging statistics internally on the BIG-IP® system. The HTTP Analytics profile must be associated with one or more
virtual servers, or an iApps® application service.
Note: Newer browsers (Internet Explorer 9 or later, Firefox 3.6 or later, or
Chrome 14 or later) support viewing Analytics charts with no additional plug-in. If
using older browsers (Internet Explorer 8 or earlier, Firefox 3.5 or earlier, or
Chrome 13 or earlier), Adobe®
Flash® Player (version 8 or later) must be installed on the
computer where you plan to view Analytics charts.
You can review statistics concerning server latency on the Analytics charts.
Server latency is how long it takes (in milliseconds ) from the time a
request reaches the BIG-IP system, for it to proceed to the web application server, and
return a response to the BIG-IP system.
Tip: If you are concerned about server latency, you can configure the
Analytics profile so that it sends an alert when the average server latency exceeds
a number of milliseconds for some period of time.
Getting an alert when server latency is high
Before you can configure the system to send alerts concerning server latency, you
need to have created an HTTP Analytics profile to collect application statistics locally
(Statistics Logging Type must have
Internal selected). To set up email alerts, the default
analytics profile must specify an SMTP
configuration.
You can configure the BIG-IP® system to send an alert when
server latency is high.
The system sends an alert when the average server latency of an application exceeds
100 ms for 300 seconds. Another alert is sent when server latency changes back to under
100 ms for 300 seconds.