On Tue, February 24, 2009 6:40 am, Piergiorgio Sartor wrote: > Hi all, > > I've a strange issue. > > I've a PC with 2 HDs in RAID-10 f2 with bitmap. > There are actually 3 md devices, boot, swap and root. > > It happens that one SATA cable is/was flaky, so sometimes, > at boot, /dev/sdb does not show up. > The RAID starts in degraded mode, tracking the writes > in the bitmap. > On the next reboot, /dev/sdb is again there, so it is > possible to re-add it. > The md device resyncs what is to be resynced, very > quickly, due to the bitmap. > > Later, if I run a check, usually a lot of mismatches > show up. 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 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. 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
