On Thu, 05 Jan 2012 13:01:52 EST erik quanstrom <[email protected]> wrote: > > if you read 1TB, you have 8% chance of a silent bad read > > sector. More important to worry about that in today's world > > than optimizing disk space use. > > 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.
Silent == unseen! Do you log RAID errors? Only way to catch them. That number is derived purely on an bit error rate (I think vendors base that on the Reed-Solomon code used). No idea how "uniformly random" the data (or medium) is in practice. I thought the "practice" was worse!
