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Disk subsystems often have redundant power supplies to improve dependability. MTTF of a single power supply is 500000 hour. Assume one power supply is sufficient

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Disk subsystems often have redundant power supplies to improve dependability. MTTF of a single power supply is 500000 hour. Assume one power supply is sufficient to run the disk subsystem and that we are adding one redundant power supply. By adding the second power supply the system becomes 4000 times more reliable. What is the MTTR of the power supply

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