erik quanstrom wrote: > do you have a citation for this? i know if you work out the > numbers from the BER, this is about what you get, but in > practice i do not see this 8%. we do pattern writes all the > time, and i can't recall the last time i saw a "silent" read error.
Yes, the real numbers are much, much lower, but still significant because they affect RAID reconstruction. See this[1] paper. Some unrelated, but interesting fact from that paper: "nearline disks (and their adapters) develop checksum mismatches an order of magnitude more often than enterprise class disk drives". [1] L. N. Bairavasundaram, G. R. Goodson, B. Schroeder, A. C. Arpaci-Dusseau, and R. H. Arpaci-Dusseau. An Analysis of Data Corruption in the Storage Stack. In FAST, 2008 http://www.cs.toronto.edu/~bianca/papers/fast08.pdf -- Aram Hăvărneanu
