On 04/24/2017 04:05 PM, Patrik Dahlström wrote: > 2017-04-24 15:39 GMT+02:00, Andreas Klauer <Andreas.Klauer@xxxxxxxxxxxxxx>: >> On Mon, Apr 24, 2017 at 02:54:50PM +0200, Patrik Dahlström wrote: >>> What offset are you referring to here? The --data-offset to the mdadm >>> --create command? >> >> Yes, data offset... > It all makes sense to me now! I believe I was still in sort of a > panicked mode yesterday. The pieces are starting to make more sense > today. Picking the offset I found out yesterday, I did indeed get a ext4 file system on the 6 disk raid. I could even mount it at one point. Strangely enough, I also got a file system on the 5 disk raid. Running a quick test showed that offset 0.5 MB to 1.5 MB (3 chunks) had identical data, and also one chunk at 32 GB. I'm gonna leave the program running for a while now and see what I can figure out. The first chunk is most probably identical too, but my program ignores chunks that are all zeros. > >> Another thing you can check is, pick an arbitrary offset that does not >> have zeroes on the disks, and see if the XOR matches for 5, or 6 disks. > I will try that when I get home. Still haven't tried this. I have some life stuff to do as well. Best regards // Patrik -- 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
