2. If assume collection of modules have exponentially distributed lifetimes (age of component doesn’t matter in…

2. If assume collection of modules have exponentially
distributed lifetimes (age of component doesn’t matter in failure
probability) and modules fail independently, overall failure rate
of collection is sum of failure rates of modules. Calculate MTTF of
a disk subsystem with • 10 disks, each rated at 1,000,000 hour MTTF
• 1 SCSI controller, 500,000 hour MTTF • 1 power supply, 200,000
hour MTTF • 1 fan, 200,000 MTTF • 1 SCSI cable, 1,000,000 hour MTTF
1) Failure Rate? 2) MTTF? 3) What if 1000,000 MTTF > 100 years,
Make an example for this condition.