uActive Redundancy:
Both components operate all the time but only
one is needed.
uFailure occurs only
when both fail or (EP1)*(EP2)
uThus
reliability is:RS = 1 - P(1-RI)
l
lExample: Use two
components and both components have a reliability of 0.90.
lIn a series| Rs = .9*.9 = .81 (above)
lRedundant| Rs = 1-(1-.9)2
= .99
lTwo
redundant components in a series|
l Rs = .99*.99 = .98