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ELJonline: Highly Available Linux Networking

Feb 21, 2002, 22:47 (0 Talkback[s])
"High availability (HA) means different things to different people. This article defines availability as the percentage of time that a computer system is capable of providing the service that it is assigned to do. A good figure of availability for computer systems that are used for business critical tasks, such as running a telephone switch or enterprise data communication network, is 99.999% of the time (five nines). This translates to less than six minutes per year that the service is not available.

CompactPCI traditionally has been the platform of choice for these five nines systems, because hot swap of components in to and out of a running system is usually also a requirement.

In a highly available network there should be multiple independent paths to each system in the network to avoid single points of failure (SPOF). Physical separation is also a good idea because if both paths are in the same conduit, and the conduit gets cut by accident, the network will go down."

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