On Mon, 16 Jun 2014 11:48:29 +1000 NeilBrown <neilb@xxxxxxx> wrote: > On Mon, 16 Jun 2014 10:59:27 +0930 Pete <psid@xxxxxxxxxxxxxxxx> wrote: > > > Hi all. Please excuse, newbie here, finding out how much I don't know > > about md. > > > > I have a RAID1 array which is running in degraded mode. When I try to > > re-add the device that used to be part of the array, I'm told that it's > > too small, though it used to be fine. > > > > /proc/mdstat: > > > > md1 : active raid1 sdc3[2] > > 2920305508 blocks super 1.0 [2/1] [_U] > > > > When I try to re-add the device that used to be part of the array, mdadm > > says it's not large enough: > > > > # mdadm --add /dev/md1 /dev/sdb3 > > mdadm: /dev/sdb3 not large enough to join array > > > > The partition tables hadn't changed when this started. Since then I've > > re-partitioned sdb to make sdb3 a few GB bigger, but it's still not > > large enough. > > > > Looking at the working device's superblock, there's a heap of "failed" > > so I'm guessing that superblock has been damaged: > > > > # mdadm -E /dev/sdc3 > > > > /dev/sdc3: > > Magic : a92b4efc > > Version : 1.0 > > Feature Map : 0x0 > > Array UUID : 129ec25f:f07e292a:5bf0829d:19793e6c > > Name : pioneer:1 (local to host pioneer) > > Creation Time : Thu Nov 21 21:19:12 2013 > > Raid Level : raid1 > > Raid Devices : 2 > > > > Used Dev Size : 5841405976 (2785.40 GiB 2990.80 GB) > > Array Size : 5840611016 (2785.02 GiB 2990.39 GB) > > Used Size : 5840611016 (2785.02 GiB 2990.39 GB) > > Super Offset : 5841406232 sectors > > State : clean > > Device UUID : 6bbc382c:244cf1ad:4fd61c87:4e40e592 > > > > Update Time : Fri Jun 13 17:05:57 2014 > > Checksum : 93cf5353 - correct > > Events : 444384 > > > > Array Slot : 2 (failed, failed, 1, failed, failed, failed, failed, > > failed, failed, failed, failed, failed, failed, failed, failed, failed, > > failed, failed, failed, failed, failed, failed, failed, failed, failed, > > failed, failed, failed, failed, failed, failed, failed, failed, failed, > > [snip] > > failed) Array State : _U 383 failed > > > > > > Could it be that whatever happened to the superblock on sdc3 is giving > > it an incorrect idea of the array size? Is that something I can fix? > > > > Would I be better off creating a new array on sdb3+missing and copying > > data to that? Then I would zero the superblock on sdc3 and hopefully > > add it to the new array. > > > > Would appreciate any help. > > I suspect that upgrading to a newer mdadm would solve most of these problems. > What are you running? (mdadm -V) > Try: > > cd /tmp > git clone git://neil.brown.name/mdadm > cd mdadm > make > ./mdadm ...... > > NeilBrown Thanks Neil. It's several years old, Ubuntu 8.04: mdadm - v2.6.3 - 20th August 2007 The server doesn't have git and I can't apt-get it since 8.04 is beyond support. I will try booting a live CD on it when I get a chance. I'd like to install a newer system, but it's used for production so that will take some planning. Regards. Pete -- 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
