On Tue, February 24, 2009 7:19 am, Piergiorgio Sartor wrote: > Hi, > >> What exactly do you mean by "check". >> >> If you mean "look in /sys/block/md0/md/mismatch_cnt", then that is >> exactly what I would expect. The resync found some differences, just >> as you would expect it to, and reported them. >> >> However if by "check" you mean: >> echo check > /sys/block/md0/md/sync_action >> mdadm --wait /dev/md0 >> cat /sys/block/md0/md/mismatch_cnt > > yes, that is what I mean. > I start the check _after_ the resync. > > Actually, maybe this is not correct, I keep running > something like: > > watch cat /proc/mdstat /sys/block/md2/md/mismatch_cnt > > So I can see real-time, so to speak, the check > progress and the mismatch count, just to have > an idea on where, on the RAID, the mismatches > could be located. > > Is this a problem? No, that isn't a problem. > >> then I would not expect any mismatches, and the resync should have >> fixed them. >> >> If it is the later, that is a real concern and I will need to look into >> it. >> Please let me know exactly which kernel version and mdadm version you >> are running. > > It is an up-to-date Fedora 10, i.e. kernel-2.6.27.15-170.2.24.fc10 > and mdadm-2.6.7.1-1.fc10. I might have found something. If the bitmap chunk size is smaller than the raid10 chunk size, and the first bitmap chunk in a raid10 chunk is clean, it might be skipping the remaining bitmap chunks in that raid10 chunk. Can you please show me "--examine" and "--examine-bitmap" of one of the devices in your array please. Thanks, NeilBrown -- 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
