On Fri, 23 Aug 2013 21:09:24 +0200 Martin Wilck [off-list ref] wrote:

On 08/23/2013 12:00 PM, Francis Moreau wrote:

quoted

[ adding Martin in CC since it seems related to DDF... ]

I reproduced it here. The problem is that mdmon isn't running. Simply
try running "mdmon /dev/md127", and the mount should proceed.

You'd avoid the problem by running "mdadm -IR /dev/sda" in the first place.

@Neil: This is unexpected, I think we need some code to start mdmon if
necessary in Manage_run. I considered coming up with a patch, but you
can do it much quicker, I think.

I've changed Manage_run() to call the same code that "mdadm -IRs" call, but
asking to just run the one array, not all arrays.
This should  do what is expected (I hope).

NeilBrown