gallery : 2001Feb10-M5 1BigBear png

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These graphs are snapshots of the MRTG graphs of web server activity on the USGS Pasadena Office web server. In each case, the activity is the traffic seen by the Squid reverse-proxy server that acts as a front-end for the main web server. The Squid server acts as an accelerator for the site. The story of how this configuration came about is told in "Web Servers, Earthquakes, and the Slashdot Effect". The blue line is the total HTTP requests/min. the green is the number of requests that were served out of the Squid cache. The brown line is the cache hit ratio.

2001Feb25-M4 4SanJose png

2001Feb01-M3 5Alameda png

2001Feb10-M5 1BigBear png
The big peak is the M5.1 Big Bear earthquake, with a 4.2 aftershock. The little peak to the left a M3.9 near Indio, and the small peak on the right is from a M4.0 near Hollister.
Feb 10-11, 2001

2001Feb25-M4 4SanJose png

2001Feb01-M3 5Alameda png


Generated by album from MarginalHacks on Fri Aug 17 16:10:31 2001