SLAC's Network Service Level Expectations

Last Update: September 3, 1996
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To set realistic expectations, we are developing a set of metrics to identify the expected and actual performance of the network.

Response time for on-site network layer < 10 msec for 95% of the samples (measured by pinging on a regular basis)
Sub-second response for the majority of trivial network service requests (e.g. a name service request, font service)>
Better than 0.25 sec response to 95% of the Ethernet requests for the SLAC Web Detailed Page. This only includes the network and server time, it does not include the time for the browser to render the page. We monitor this every 15 minutes from Peleus which is one router hop from the WWW server.
Network reachability* of >= 99% (measured by the DECmsu Network Monitoring System)
95% of trivial mail (not forwarded or rerouted, not involving SLACVM, and < 10 KBytes/item) is delivered on site within 10 minutes

We monitor and keep track of many of the network components and services. By setting thresholds on various measurements or combinations of measurements we are better able to be alerted to when there may be troubles in meeting the expectations.

Les Cottrell

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