Re: mdadm failed to remove internal bitmap

[NeilBrown <neilb@suse.de>]

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On Fri, 13 Feb 2015 17:46:46 +0800 gary <gary.mdjiang@gmail.com> wrote:

> Hi,
> 
> I used v3.3.1 mdadm to do some test for bitmap, but when switch bitmap from
> internal to none, the output shows fail info about remove internal 
> bitmap, is it
> just a warning? Since the bitmap seems to be cleared, and it doesn't 
> show with
> v3.2.6 mdadm with the same steps.
> 
> linux:~ # mdadm --create md0 --raid-devices=2 --level=mirror 
> --assume-clean /dev/vdb /dev/vdc
> mdadm: Note: this array has metadata at the start and
>      may not be suitable as a boot device.  If you plan to
>      store '/boot' on this device please ensure that
>      your boot-loader understands md/v1.x metadata, or use
>      --metadata=0.90
> Continue creating array? y
> mdadm: Defaulting to version 1.2 metadata
> mdadm: array /dev/md/md0 started.
> linux:~ # cat /proc/mdstat
> Personalities : [raid1]
> md127 : active raid1 vdc[1] vdb[0]
>        523712 blocks super 1.2 [2/2] [UU]
> 
> unused devices: <none>
> linux:~ # mdadm --grow --bitmap=internal /dev/md127
> linux:~ # cat /proc/mdstat
> Personalities : [raid1]
> md127 : active raid1 vdc[1] vdb[0]
>        523712 blocks super 1.2 [2/2] [UU]
>        bitmap: 1/1 pages [4KB], 65536KB chunk
> 
> unused devices: <none>
> linux:~ # mdadm --grow --bitmap=none /dev/md127
> mdadm: failed to remove internal bitmap.
> linux:~ # cat /proc/mdstat
> Personalities : [raid1]
> md127 : active raid1 vdc[1] vdb[0]
>        523712 blocks super 1.2 [2/2] [UU]
> 
> unused devices: <none>
> 

I cannot reproduce this.
What kernel are you running?

Please use "strace" on mdadm in a case where it fails, and post the result.

NeilBrown

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