Have you tried pulling down the latest version of mdadm from Neil's
site with:
git clone git://neil.brown.name/mdadm/ mdadm
cd mdadm
./configure
make
and seeing if that custom build does the trick for you? I know he's
done some newer patches which might help in this case.
Another> I'd read that a couple of days back and while it's an interesting idea
Another> I don't believe it will address my specific issue of the array not
Another> allowing re-assembly (even with force and read only flags set) as
Another> mdadm reports the 'need backup file for reshape, sorry' error no
Another> matter what I've tried.
Another> Even trying the above flags with invalid-backup does not work so I
Another> need someone to have a eureka moment and say "....it's this....".
Another> I believe that mdadm 3.3 incorporated the recover during reshape
Another> functionality, however I've read elsewhere it only applies to
Another> expansion into a new drive...I was going RAID6 to RAID5 (even though
Another> it never really got started) and the backup file looks like 20mb of
Another> EOLs.
Another> So at he moment I'm pretty much stuck unless someone can tell me how
Another> to clear down the reshape flag, even in read only mode so I can copy
Another> the data off.
Another> On 3 March 2016 at 17:48, Sarah Newman <srn@xxxxxxxxx> wrote:
>> On 03/03/2016 06:07 AM, Another Sillyname wrote:
>>> Plenty of hits....but no clear fixes and as I said I'm not willing to
>>> 'try' things from google hits until someone with better insight can
>>> give me a view.
>>>
>>> Trying things is fine in many instances, but not with a 20+TB data set
>>> as I'm sure you can understand.
>>>
>>
>> I have not tried this personally, but it may be of interest:
>> https://raid.wiki.kernel.org/index.php/Recovering_a_failed_software_RAID#Making_the_harddisks_read-only_using_an_overlay_file I found this explanation
>> of the dmsetup commands to be more easy to follow: http://www.flaterco.com/kb/sandbox.html
>>
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