contestada

In a server farm such as that used by Amazon or eBay, a single failure does not cause the entire system to crash. Instead, it will reduce the number of requests that can be satisfied at any one time. If a company has 10,000 computers, each with a MTTF of 35 days, and it experiences catastrophic failure only if 1/3 of the computers fail, what is the MTTF for the system? (Assume that computers are not repaired.)

Respuesta :

Answer:12 days

Explanation:

Mean time to failure is given by

MTTF=[tex]\frac{Total working hours of running}{Total no. of units}[/tex]

Let's say N is the average amount  of time system runs until [tex]\frac{1}{3}[/tex] computer fail

MTTF of each computer =35

35=[tex]\frac{n\cdot 10,000}{10,000\cdot \frac{1}{3}}[/tex]

[tex]35=N\cdot 3[/tex]

N=[tex]\frac{35}{3}=11.667\approx 12days[/tex]

Otras preguntas