"Down time used to be our most profitable product," jokes Domas Mituzas, a performance engineer at Wikipedia. The gag is that when Wikipedia is offline, the site often displays a page seeking donations for additional servers.
As a non-profit running one of the world's busiest web destinations, Wikipedia provides an unusual case study of a high-performance site. In an era when Google and Microsoft can spend a half-billion dollars on one of their global data center projects, Wikipedia runs on fewer than 300 servers from a single data center in Tampa, Fla. It also has servers in Amsterdam at the AMS-IX peering exchange.
The rest of the article from Data Center Knowledge is here.
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