Scrubbing
This lesson discusses how unchecked data can be problematic and disk scrubbing can help remedy this.
Given all of the discussion in this chapter, you might be wondering: when do these checksums actually get checked? Of course, some amount of checking occurs when data is accessed by applications, but most data is rarely accessed, and thus would remain unchecked. Unchecked data is problematic for a reliable storage system, as bit rot could eventually affect all copies of a particular piece of data.
To remedy this problem, many systems utilize
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