Hi Neil,
Thanks for the quick response!
On Sun, Aug 24, 2014 at 01:09:39PM +1000, NeilBrown wrote:
> raid10 reshape is only supported for v1.x metadata, and you have 0.90.
> This is because it needs to move the data_offset and 0.90 cannot do that.
>
> I see you have already adjusted the --array-size correctly - good.
>
> You can achieve your result by:
>
> 1/ stop the array and assemble with --update=metadata. This will convert the
> array to v1.0
I've now done this, so:
$ sudo mdadm --detail /dev/md2
/dev/md2:
Version : 1.0
Creation Time : Sun Jun 4 08:18:59 2006
Raid Level : raid10
Array Size : 618726528 (590.06 GiB 633.58 GB)
Used Dev Size : 309363264 (295.03 GiB 316.79 GB)
Raid Devices : 6
Total Devices : 6
Persistence : Superblock is persistent
Update Time : Sun Aug 24 14:29:15 2014
State : active
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 64K
Name : 2
UUID : 3905b303:ca604b72:be5949c4:ab051b7a
Events : 1
Number Major Minor RaidDevice State
0 8 51 0 active sync /dev/sdd3
1 8 67 1 active sync /dev/sde3
2 8 83 2 active sync /dev/sdf3
3 8 19 3 active sync /dev/sdb3
4 8 35 4 active sync /dev/sdc3
5 8 3 5 active sync /dev/sda3
I noticed something: The assemble with update re-set the array size
to 928089792 (885.10 GiB 950.36 GB).
(the above --detail is after all steps below)
> 2/ "mdadm /dev/md2 --grow --disks=4" That should perform the reshape.
I assume that should have been --raid-devices; --disks seems to be a
syntax error. :)
Firstly it told me the array was too big, as expected.
$ sudo ./mdadm /dev/md2 --grow --raid-devices=4
mdadm: this change will reduce the size of the array.
use --grow --array-size first to truncate array.
e.g. mdadm --grow /dev/md2 --array-size 618726528
unfreeze
Okay.
$ sudo ./mdadm --grow /dev/md2 --array-size 618726528
But:
$ sudo ./mdadm /dev/md2 --grow --raid-devices=4
mdadm: Cannot set new_data_offset: RAID10 reshape not
supported on this kernel
> I guess the error message could be better....
Will be happy to send the trivial patch once we get to the bottom of
this!
Cheers,
Andy
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