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SubjectRe: cannot add device to partitioned raid6 array
On Saturday March 31, flockmock@gmx.at wrote:
> hi list!
>
> in short:
> I created a partitioned raid6 array with 2 missing drives. Now, I want to add a device. It fails with:
> flockmock ~ # mdadm -a /dev/md_d4 /dev/sdb2
> mdadm: add new device failed for /dev/sdb2 as 4: Invalid argument

Thanks for the detailed problem report.

I think the cause of the error is that /dev/sdb2 is too small.
It needs to be at least 490030594 sectors. How big is it?

Yes, both the kernel an mdadm should handle this case better.
I have made a note to look into this.

NeilBrown
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