A New Problem: Misdirected Writes
In this lesson, we look at the problem of misdirected writes and discuss a solution for it.
We'll cover the following...
The basic scheme described in the previous lesson works well in the general case of corrupted blocks. However, modern disks have a couple of unusual failure modes that require different solutions.
The first failure mode of interest is called a misdirected write. This arises in disk and RAID controllers which write the data to disk correctly, except in the wrong location. In a single-disk system, this means that the disk wrote block ...
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