> -----Original Message----- > From: Mark Knecht [mailto:markknecht@xxxxxxxxx] > Sent: Sunday, January 02, 2011 7:58 PM > To: lrhorer@xxxxxxxxxxx > Cc: linux-raid@xxxxxxxxxxxxxxx > Subject: Re: Mismatches > > On Sun, Jan 2, 2011 at 5:53 PM, Leslie Rhorer <lrhorer@xxxxxxxxxxx> wrote: > <SNIP> > > > >> It was my understanding when researching RAID6 last week that the two > >> parity calculations are actually different. Only one of them is simple > >> parity. The the other is part of an advanced math degree. ;-) > >> (According to Wikipedia, not a definitive source for sure...) > > > > Well, that's encouraging, if true. It doesn't explain how big > > chunks of data in almost every large file got corrupted, though. > > > > > > If it's real and not some strange bug then it certainly doesn't. > > Neil had some very good responses. > > Also, what does > > smartctl -a /dev/sdX say for each drive? Any indication at all of > _any_ drive having problems? Well, not exactly, no. Some of the drives do have errors, but none have any huge amount. Most of the errors were accumulated when I had a bad RAID chassis a couple of years ago that caused all sorts of grief. Most of the drives have been quiet since then, with the exception of the Hitachi drives. All six Hitachi drives show an event 675 hours (28 days, 3 hours) ago. None of the other drives show anything in that time frame, and none of the drives at all show anything since. That must have been when the system croaked after starting the RAID reshape. I don't see how that, in and of itself, would cause all those mismatches. -- 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
