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.
On the Main tab, click
The Statistics: Analytics screen opens and shows charts with application statistics.
From the Time Period list (on the right), select the amount of time (last hour, day, week, or month) for which you want to view the statistics.
Tip: To display reports for a specific time period, for the View setting, select Advanced. In the Time Period list, you can then select Custom and specify the beginning and end dates.
From the Latency menu, click Server Latency.
A chart shows the server latency for all applications and virtual servers associated with all Analytics profiles.
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.
To view server latency for a specific virtual server:
Virtual Servers tab.
The charts show latency for all virtual servers.
In the Total Average Server Latency chart on the right, click the virtual server you are interested in.
The charts show latency only for the selected virtual server.
If further investigation is needed, click the other tabs on the Analytics
screen to view charts that show latency for other collected entities selected 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.