Arup's low energy Citi data centre | Archive Titles

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%