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Manual Chapter: Investigating Server Latency Issues
Manual Chapter
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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 Analytics profile that is logging statistics internally on the BIG-IP® system. In the profile, the statistics gathering configuration must have Server Latency selected as one of the collected metrics. The Analytics profile must be associated with one or more virtual servers, or an iApps™ application service. To view Analytics statistics properly, Adobe Flash Player must be installed on the computer where you plan to view them.
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.
  1. On the Main tab, click Statistics > Analytics. The Analytics Overview screen opens and shows a summary of the most active application traffic, such as the top URLs, top virtual servers, top pool members, top response codes, and top countries in recent times. Settings in the associated Analytics profile govern what you see on this screen.
  2. From the Latency menu, click Server Latency. A chart shows the server latency for all applications and virtual servers associated with all Analytics profiles.
  3. To view server latency for a specific application, in the Details table, select only that application. The charts show latency only for the selected application.
  4. To view server latency for a specific virtual server:
    1. In the View By list, select Virtual Servers. The charts show latency for all virtual servers.
    2. In the Details list below the charts, click the virtual server you are interested in. The charts show latency only for the selected virtual server.
  5. If further investigation is needed, in the View By setting, select other entities to view charts that show latency for other collected entities included in the Analytics profile, for example, specific pool members, URLs, countries, or client IP addresses.
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.
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