Re: Start reshape failed

[NeilBrown <nfbrown@novell.com>]

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On Wed, Dec 16 2015, Kev Dorman wrote:

> Hi,
>
> Xiao Ni posted back in September about a problem where mdadm --grow fails with:
>
> mdadm: Failed to initiate reshape!
>
> I'm seeing the same problem, with mdadm 3.3.4, Kernel 4.3.0.  I can
> reproduce this reliably
> when adding a device to a 2-device raid0 array.  Instead of switching
> to raid4 for the
> reshape, then switching back to raid0 when done, it ends up in raid4
> in recovery mode.
>
> I tried the suggested change of adding a call to md_check_recovery()
> in action_store(),
> and that does seem to help most of the time.
>
> I was curious if there is a better solution, and/or if this or another
> change will show up in
> 4.3.x soon.

I have a patch queued in my for-next branch which I'll send to Linus
before Christmas.  It should then get into 4.3.x in early January (at a
guess).

NeilBrown

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