Obtaining Five “Nines” of Availability for Internet Services
نویسنده
چکیده
Ensuring high availability of a service is a costly task. This paper discusses arguments for and against obtaining five “nines” of availability (99.999% availability) with the assumption that the clients operate at only three nines of availability (99.9% availability). Based on a simulation created for this purpose and real market data, the paper takes the position against obtaining five “nines” of availability on account of user impact. However, for highly profitable Internet services, obtaining higher levels of availability will increase their profit regardless of the user experience.
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