Re: add another disk to existing raid 0, ie grow raid 0 possible?

[Nikolay Kichukov <hijacker@oldum.net>]

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Hi Neil,
Do you think it will make sense to try to replicate using loop devices?

Cheers,
- -Nik

On 02/09/2012 05:50 AM, NeilBrown wrote:
> On Thu, 26 Jan 2012 13:30:53 +0200 Nikolay Kichukov <hijacker@oldum.net>
> wrote:
> 
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>> Hello Neil,
> 
>> Here goes the details. Once again, no valuable data, just curious what has gone wrong in that case:
> 
>> dmesg output, first I stopped md2, then assembled it again to perform the grow.
>> http://pastebin.com/HkPVEKad
> 
>> mdadm -E output:
>> http://pastebin.com/pJCjvrJE
> 
>> The system runs GNU/Debian testing with latest updates from security-testing applied.
>> Kernel: 3.1.0-1-amd64
>> mdadm:  3.2.2-1
> 
>> Let me know should you need any further information.
> 
> I've finally had a look at this and unfortunately cannot find the problem.
> The main reason being that I cannot reproduce it.
> I built the same kernel and mdadm and created a very similar array and
> tried to grow it and it all went smoothly.
> 
> In your case it didn't start the reshape at all (reshape position was zero) so
> something went wrong very early.
> 
> If you feel like trying to reproduce it again that might be helpful.
> Then I would ask you to run the "mdadm --grow" command under 
>     strace -o /tmp/foo -f mdadm --grow ....
> 
> and send me the /tmp/foo.  But I won't be surprised if you cannot reproduce.
> Sad really.
> 
> Thanks anyway,
> NeilBrown
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