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Table 1: Enhanced reliability of Citi data centre back-up system | ||
Parameter | Static UPS | DRUPS |
Failure frequency (per year) | 2.6 x 10-3 | 1.8 x 10-3 |
Mean time between failures (years) | 385 | 550 |
Unavailability | 4.1 x 10-6 | 2.8 x 10-6 |
Availability | 99.99959% | 99.99972% |
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