Question: Assume a disk subsystem with the following components and MTTF: x disks each rated at 1,000,000-hour MTTF 1 SCSI Controller rated at 500,000-hour MTTF 1

Assume a disk subsystem with the following components and MTTF:

  • x disks each rated at 1,000,000-hour MTTF
  • 1 SCSI Controller rated at 500,000-hour MTTF
  • 1 Power Supply rated at 200,000-hour MTTF
  • 1 Fan rated at 200,000-hour MTTF
  • 1 Processor rated at 100,000-hour MTTF

(a) How many disks can we support such that the MTTF of the entire system is at least 5 years (assume a year has 365 days).

(b) Suppose MTTR of the entire system is 200 hours, what is the availability of the system?

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