When calculating the reliability of systems with multiple disks, such as RAID arrays, it is conceptually obvious that if one drive has a probability of failure of one in a thousand, the probability of two drives failing is one in a million because independent probabilities multiply. Why is this statement probably false?
What will be an ideal response?
The reliability of the system depends not only on the drives themselves. There are components common to the system such as the power supply. There is also a RAID controller to take into account. This means that the probability of two failures on a RAID array is higher than the simple p2 figure compared to a non?RAID system.
Moreover, if a disk fails because it is part of a defective batch, there is a possibility that another disk may have come from the same batch – reducing the benefits of a RAID array.
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What will be an ideal response?