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! Exercise 13.4.4: Suppose that a disk has probability F of failing in a given year, and it takes H hours to replace a disk.

! Exercise 13.4.4: Suppose that a disk has probability F of failing in a given year, and it takes H hours to replace a disk. a) If we use mirrored disks, what is the mean time to data loss, as a function of F and H ? b) If we use a RAID level 4 or 5 scheme, with N disks, what is the mean time to data loss?

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