From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: invalid bitmap file superblock: bad magic
Date: Fri, 9 Mar 2012 07:00:41 +1100
Message-ID: <20120309070041.558a4ca6@notabene.brown>
References: <201203081711.17836.a.miskiewicz@gmail.com>
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To: Arkadiusz =?UTF-8?B?TWnFm2tpZXdpY3o=?= <a.miskiewicz@gmail.com>
Cc: linux-raid@vger.kernel.org
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On Thu, 8 Mar 2012 17:11:17 +0100 Arkadiusz Mi=C5=9Bkiewicz
<a.miskiewicz@gmail.com> wrote:

> Hello.
>=20
> I'm trying to create internal bitmap on freshly created
> raid1 array on 3.2.6 kernel.
>=20
> What's going on and how to fix this problem?

There is a bug in the latest mdadm which causes this.
It is fixed in git, or use a slightly older mdadm.

I notice a subsequent email where it magically started working.  I cannot
explain that - something must have happened to trigger it.

NeilBrown


>=20
> [root@setebos ~]# mdadm /dev/md3 --grow --bitmap=3Dinternal              =
                                                                           =
         =20
> mdadm: failed to set internal bitmap.
> [root@setebos ~]# dmesg|tail -n 16                                       =
                                                                           =
       =20
> [10455.564598] mdadm: sending ioctl 1261 to a partition!
> [10455.564601] mdadm: sending ioctl 1261 to a partition!
> [10455.566566] mdadm: sending ioctl 1261 to a partition!
> [10455.566570] mdadm: sending ioctl 1261 to a partition!
> [10455.568480] md3: invalid bitmap file superblock: bad magic
> [10455.568483] md3: bitmap file superblock:
> [10455.568485]          magic: 00000000
> [10455.568487]        version: 0
> [10455.568489]           uuid: 00000000.00000000.00000000.00000000
> [10455.568491]         events: 0
> [10455.568492] events cleared: 0
> [10455.568494]          state: 00000000
> [10455.568495]      chunksize: 0 B
> [10455.568497]   daemon sleep: 0s
> [10455.568498]      sync size: 0 KB
> [10455.568499] max write behind: 0
> [root@setebos ~]# mdadm --detail /dev/md3
> /dev/md3:
>         Version : 1.2
>   Creation Time : Thu Mar  8 13:54:16 2012
>      Raid Level : raid1
>      Array Size : 931760807 (888.60 GiB 954.12 GB)
>   Used Dev Size : 931760807 (888.60 GiB 954.12 GB)
>    Raid Devices : 2
>   Total Devices : 2
>     Persistence : Superblock is persistent
>=20
>     Update Time : Thu Mar  8 18:46:11 2012
>           State : clean
>  Active Devices : 2
> Working Devices : 2
>  Failed Devices : 0
>   Spare Devices : 0
>=20
>            Name : rescue:3
>            UUID : 390e347b:c63b1a0e:1ff4f4a5:bc51f5c6
>          Events : 24
>=20
>     Number   Major   Minor   RaidDevice State
>        0       8        4        0      active sync   /dev/sda4
>        1       8       20        1      active sync   /dev/sdb4
> [root@setebos ~]# cat /proc/mdstat
> Personalities : [raid1]
> md3 : active raid1 sda4[0] sdb4[1]
>       931760807 blocks super 1.2 [2/2] [UU]
>=20
> md1 : active raid1 sda2[0] sdb2[1]
>       995904 blocks [2/2] [UU]
>=20
> md0 : active raid1 sda1[0] sdb1[1]
>       3999117 blocks super 1.2 [2/2] [UU]
>=20
> md2 : active raid1 sda3[0] sdb3[1]
>       40000754 blocks super 1.2 [2/2] [UU]
>       bitmap: 1/1 pages [4KB], 65536KB chunk
>=20
> unused devices: <none>
> [root@setebos ~]#
>=20
>=20


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