JakkFrosted said:How frequent of a problem is data corruption?
With multi-terabyte disks, corruption is inevitable. See this report from CERN, for example. Or this one from NEC. Or this more mainstream one. I could google more for you, but perhaps these will be enlightening.
JakkFrosted said:I have never had to deal with it in my 7 years of server adminning. I host simple websites on my servers and a few other server programs here and there.
That you know of. When you deal with tens of thousands of disks and petabytes of data, this sort of data corruption is patently obvious. And that's with enterprise class drives, excellent environmentals and sophisticated monitoring. We probably shred more failed disks a month than you've used total in seven years.
That experience is why I use ZFS on any data I really care about. Because I can calculate how long it's going to take statistically for it to be unrecoverable.