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From Peter Phaal <>
Subject [users@httpd] Monitoring web cluster performance
Date Thu, 02 Feb 2012 23:13:55 GMT
Hi All,

Anyone using Ganglia to monitor their servers might be interested to
know that Ganglia 3.3 now includes support for mod-sflow, providing a
great way to monitor the health of an Apache cluster - not just HTTP
performance, but also the CPU, memory, disk and network I/O. If you
are using Tomcat for the application tier, the SFlowValve exports HTTP
and JVM metrics. If you are using a Memcached cluster for caching,
there is an sFlow agent available.

For more information, see:

There is also a solution for Graphite:

The following case study from, a large social networking
site, describes some of the operational benefits of using sFlow for


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