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Comment A good monitoring system helps (Score 3, Interesting) 64

You should be using your monitoring system to gather performance data, and then analyzing that data.

I am partial to check_mk right now, but I've done this kind of thing on nagios with pnp4nagios. When you have your monitoring system gathering network interface data, disk usage, cpu utilization, etc, and storing it in some kind of database like rrd, influxdb, or graphite, it isn't that much of a stretch to examine that data as an aggregate and graph trends. It really is amazing all the stuff you can figure out with this technique.

"Consider a spherical bear, in simple harmonic motion..." -- Professor in the UCB physics department