> Coming from the zfs world, I've heard a few talk about the chances of > "silent errors", meaning the checksum on the drives match, but the > data being bad because of matching checksum (aka collisions). Does > anyone in here know the relative chance of something like that > happening with the checksums of current harddisks? Is the 1:10^14 or > 1:10^15 chances for a URE in regard to this, or is that when the drive > reports an error, or those two combined? A follow-up here. I see drive manufacturers report the chance of an URE is 1:10^14 for desktop drives, 1:10^15 for 7k2RPM enterprise drives and 1:10^16 for 10k and 15k enterprise drives (or most do). I was under the impression that "nearline" / 7k2 enterprise drives were the same thing as desktop drives, only with a slightly different firmware (TLER and friends => don't do anything as stupid as going into "deep recovery mode" like some desktop drives do). Any idea if there's a real difference between the hardware on enterprise and desktop 7k2 drives? Is this 10-fold difference between error rates real, or is it just marketing? 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
