> >> The probability of a URE during rebuild increases with the number > >> and > >> size of the source drives being read to rebuild the failed drive. > >> Thus > >> the probability of encountering a URE in the 1:1 drive scenario is > >> extremely low, close to zero if you believe manufacturer specs. > > > > For a 2TB drive and BER 10^-14 (common for non-enterprise drives), > > the > > probability is 1/6 of a single URE for a read of the entire drive. > > If my math is correct, with a URE rate of 10E14, that's one URE for > every ~12.5TB read. So theoretically one would have to read the entire > 2TB drive more than 6 times before hitting the first URE. So it seems > unlikely that one would hit a URE during a mirror rebuild with such a > 2TB drive. ok, perhaps, maybe, but then it's 17% chance of losing data after a mirror or raid-5 rebuild with 2TB drives, or the double of that if using 4TB drives. That's not very amusing… Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy@xxxxxxxxxxxxx http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
