On Tue, Dec 20 2016, Robert LeBlanc wrote:
> I have an array that failed to readd a member saying that the new
> member was too small. After trying a few things including "--add",
> "--force", zeroing out the superblock, clearing out the first 100 MB
> to get rid of the partition table, I found that mdadm thinks the Used
> Dev Size is unknown. I looked at the superblock and it appears to have
> a valid used dev size. Both disks are exactly the same size. I'm not
> sure how fix this.
>
> # mdadm --version
> mdadm - v3.3.2 - 21st August 2014
Try a newer mdadm.
git clone git://git.kernel.org/pub/scm/utils/mdadm/mdadm.git
cd mdadm
make
your bug sounds familiar. I think it has been fixed.
NeilBrown
>
> # mdadm --detail /dev/md_root
> /dev/md_root:
> Version : 1.0
> Creation Time : Wed Sep 7 15:58:30 2016
> Raid Level : raid1
> Array Size : 5368708928 (5120.00 GiB 5497.56 GB)
> Used Dev Size : unknown
> Raid Devices : 2
> Total Devices : 1
> Persistence : Superblock is persistent
>
> Intent Bitmap : Internal
>
> Update Time : Mon Dec 19 17:05:29 2016
> State : clean, degraded
> Active Devices : 1
> Working Devices : 1
> Failed Devices : 0
> Spare Devices : 0
>
> Name : 10.91.0.11-volume
> UUID : 2ea91e32:59b7806d:956803c6:00c410eb
> Events : 3691225
>
> Number Major Minor RaidDevice State
> 0 8 16 0 active sync /dev/sdb
> 2 0 0 2 removed
>
> # mdadm --detail /dev/md_root
> /dev/md_root:
> Version : 1.0
> Creation Time : Wed Sep 7 15:58:30 2016
> Raid Level : raid1
> Array Size : 5368708928 (5120.00 GiB 5497.56 GB)
> Used Dev Size : unknown
> Raid Devices : 2
> Total Devices : 1
> Persistence : Superblock is persistent
>
> Intent Bitmap : Internal
>
> Update Time : Mon Dec 19 17:05:29 2016
> State : clean, degraded
> Active Devices : 1
> Working Devices : 1
> Failed Devices : 0
> Spare Devices : 0
>
> Name : 10.91.0.11-volume
> UUID : 2ea91e32:59b7806d:956803c6:00c410eb
> Events : 3691225
>
> Number Major Minor RaidDevice State
> 0 8 16 0 active sync /dev/sdb
> 2 0 0 2 removed
>
> # hexdump -C -s 5497558130688 /dev/sdb
> 4ffffffe000 fc 4e 2b a9 01 00 00 00 01 00 00 00 00 00 00 00
> |.N+.............|
> 4ffffffe010 2e a9 1e 32 59 b7 80 6d 95 68 03 c6 00 c4 10 eb
> |...2Y..m.h......|
> 4ffffffe020 31 30 2e 39 31 2e 30 2e 31 31 2d 76 6f 6c 75 6d
> |10.91.0.11-volum|
> 4ffffffe030 65 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |e...............|
> 4ffffffe040 86 8d d0 57 00 00 00 00 01 00 00 00 00 00 00 00
> |...W............|
> 4ffffffe050 80 fe ff 7f 02 00 00 00 00 00 00 00 02 00 00 00
> |................|
> 4ffffffe060 a0 ff ff ff 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> 4ffffffe070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> 4ffffffe080 00 00 00 00 00 00 00 00 e8 fe ff 7f 02 00 00 00
> |................|
> 4ffffffe090 f0 ff ff 7f 02 00 00 00 00 00 00 00 00 00 00 00
> |................|
> 4ffffffe0a0 00 00 00 00 00 00 00 00 4c 6c 99 5a bd 1a 4c 7d
> |........Ll.Z..L}|
> 4ffffffe0b0 32 29 7a bc e2 45 89 dd 00 00 08 00 f8 ff ff ff
> |2)z..E..........|
> 4ffffffe0c0 4f 66 58 58 00 00 00 00 7b 33 38 00 00 00 00 00
> |OfXX....{38.....|
> 4ffffffe0d0 ff ff ff ff ff ff ff ff 33 f3 f0 e6 80 00 00 00
> |........3.......|
> 4ffffffe0e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> *
> 4ffffffe100 00 00 fe ff fe ff fe ff fe ff fe ff fe ff fe ff
> |................|
> 4ffffffe110 fe ff fe ff fe ff fe ff fe ff fe ff fe ff fe ff
> |................|
> *
> 4ffffffe200 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> *
> 50000000000
>
> # blockdev --report /dev/sd[a,b]
> RO RA SSZ BSZ StartSec Size Device
> rw 256 512 4096 0 5497558138880 /dev/sda
> rw 256 512 4096 0 5497558138880 /dev/sdb
>
> # mdadm /dev/md_root --add /dev/sda
> mdadm: /dev/sda not large enough to join array
>
> ----------------
> Robert LeBlanc
> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
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