Assume that a computer has two 1TB disks, D0 and D1. The Mean Time to Failure (MTTF) of each disk is 1M hours. a. If the disk system is configured to have 2TB total storage capacity, when any of the two disks fails, the disk system fails. What is the MTTF of the disk system? b. Mirroring (RAID-1) is a technique can improve the reliability of disk systems by using redundancy. Each data block will have two identical copies stored in both D0 and D1. Under this configuration, the disk system has only 1TB total storage capacity; but it only fails when both disks fail (e.g. when the failed disk is being repaired, the second disk also fails). If the MTTR of a failed disk is 20 hours, what is the MTTF of the disk system now?
Assume that a computer has two 1TB disks, D0 and D1. The Mean Time to Failure (MTTF) of
each disk is 1M hours.
a. If the disk system is configured to have 2TB total storage capacity, when any of the two disks
fails, the disk system fails. What is the MTTF of the disk system?
b. Mirroring (RAID-1) is a technique can improve the reliability of disk systems by using
redundancy. Each data block will have two identical copies stored in both D0 and D1. Under this
configuration, the disk system has only 1TB total storage capacity; but it only fails when both
disks fail (e.g. when the failed disk is being repaired, the second disk also fails). If the MTTR of a
failed disk is 20 hours, what is the MTTF of the disk system now?
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