On Tue, 22 Feb 2011 08:41:02 +0100 Albert Pauw <albert.pauw@xxxxxxxxx> wrote: > I experimented a bit further, and may have found an error in mdadm. > > Again, this was my setup: > - OS Fedora 14 fully updated, running in VirtualBox > - mdadm version 3.1.4, fully updated (as of today) from the git repo > - Five virtual disks, 1 GB each, to use > > I created two raid sets out of one ddf container: > > mdadm -C /dev/md127 -l container -e ddf -n 5 /dev/sd[b-f] > mdadm -C /dev/md1 -l 1 -n 2 /dev/md127 > mdadm -C /dev/md2 -l 2 -n 3 /dev/md127 > > Disks sdb and sdc were used for the RAID 1 set, disks sdd, sde, sdf were > used for the RAID 5 set. > All were fine and the command mdadm -E /dev/md127 showed all disks > active/Online > > Now I failed one of the disks of md1: > > mdadm -f /dev/md1 /dev/sdb > > Indeed, looking at /proc/mdstat I saw the disk marked failed [F] before > it was automatically removed within a second (a bit weird). > > Now comes the weirdest part, mdadm -E /dev/md127 did show one disk as > "active/Online, Failed" but this was disk sdd > which is part of the other RAID set! Yes .. that is weird. I can reproduce this easily. I had a look through the code and it looks right so there must be something subtle... I'll look more closely next wee when I'll have more time. > > When I removed the correct disk, which can only be done from the container: > > mdadm -r /dev/md127 /dev/sdb > > the command mdadm -E /dev/md127 showed the 5 disks, the entry for sdb > didn't had a device but was still > "active/Online" and sdd was marked Failed: > > Physical Disks : 5 > Number RefNo Size Device > Type/State > 0 d8a4179c > 1015808K active/Online > 1 5d58f191 1015808K /dev/sdc > active/Online > 2 267b2f97 1015808K /dev/sdd > active/Online. Failed > 3 3e34307b 1015808K /dev/sde > active/Online > 4 6a4fc28f 1015808K /dev/sdf > active/Online > > When I try to mark sdd as failed, mdadm tells me that it did it, but > /proc/mdstat doesn't show the disk as failed, > everything is still running. I also am not able to remove it, as it is > in use (obviously). > > So it looks like there are some errors in here. 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
