Comment Flawed logic (Score 1) 258
"We observe that the same objectives cannot be reached with RAID level 6 organizations and would require RAID stripes that could tolerate triple disk failures."
That's true only if you assume that three disk failures occur faster than a single disk can be rebuilt.
If you assume no more than two disk failures *during the length of time it takes to rebuild the array* then RAID 5 or RAID 6 works fine as long as you assign enough hot spares.