Suppose that a basic disk read can sometimes read values that are different from those written. State the type of failure exhibited by a basic disk read. Suggest how this failure may be masked in order to produce a different benign form of failure. Now suggest how to mask the benign failure.
What will be an ideal response?
The basic disk read exhibit arbitrary failures.
This can be masked by using a checksum on each disk block (making it unlikely that wrong values will go undetected) - when an incorrect value is detected, the read returns no value instead of a wrong value - an omission failure.
The omission failures can be masked by replicating each disk block on two independent disks. (Making omission failures unlikely).
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