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Disaster Recovery (DR) Architecture on AWS, Part III: Pilot Light and Warm Standby | AWS Architecture Blog
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Redundancy allocation of mixed warm and cold standby components in repairable K-out-of-N systems - Min Gong, Hanlin Liu, Rui Peng, 2020
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Reliability and Effective Failure Rate of "n" Active Redundant Units, with "m" Required for Success, and "n-m" Cold Standby Units
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