Hot standby
A networking device that is powered, configured and ready to take over from a companion device should it fail. Examples include disk drives that are spinning and ready for write operations and dual-homed switches on FDDI networks (which are designed for fault tolerance).
Some service providers now offer outsourced hot-standby services for everything from messaging to basic communications - typically at a percentage of the cost of a customer setting up a true hot-standby backup for critical devices or services.
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