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
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