On 05/29/2015 07:19 PM, NeilBrown wrote:

On Fri, 29 May 2015 19:13:38 +0800 XiaoNi [off-list ref] wrote:

quoted

And it's really the problem about selinux. The patch works after the
command "setenforce 0". It need the patch you gave.  Is it right
to setenforce 0 every time? I'll read the doc about selinux.

I know nothing about selinux, and don't really want to.
Presumably selinux needs to be told that mdadm, when run from systemd, can
access all block devices.
If there is something I can add to the system unit file to make this happen
I am happy to, but I would need someone to tell me what.

Glad you are making progress and learning a lot!!

NeilBrown

But it really need the patch you gave several days before. I already 
tried without the patch, reshape can be
stuck even selinux is set to Permissive.

And it's a problem with systemd and selinux too. If I run mdadm --grow 
--continue /dev/md0, the reshape can start.
If I run systemctl start mdadm-grow-continue@md0.service, it can't 
start. I'll look for the answer.

Best Regards
Xiao