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Duplexed Systems

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A duplexed system provides data protection in the form of mirroring, in which data is simultaneously written in two places at once. Mirroring implies that two disks are present, but attached to one disk channel (adapter card). Duplexing implies that each disk is attached to its own adapter card, which adds another level of protection. The entire server can also be duplexed so users are never without a server should one server go down. Duplexed servers are attached with high-speed interfaces (fiber) and can be placed in separate locations to protect them from local disasters.

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