November 11, 2002 Archives

Fault tolerance

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Joe Armstrong talked about the Erlang at the Lightweight Languages Workshop 2002 (LL2).

At the end of his talk he mentions a few products using Erlang, one of them an Ericsson ATM switch (AXD301). It's used by British Telecom and has a fault tolerance of 99.9999999% (9 nines!). That's 31 ms a year. As he said "Not bad". Wow. I wonder if we'll ever get used to the lower reliability of internet telephony or if the internet will get more reliable or if we'll just never switch.

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