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From: Neil Brown <neilb@suse.de>
To: "Florian D." <flockmock@gmx.at>
Date: Sun, 1 Apr 2007 12:57:41 +1000
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Cc: linux-kernel@vger.kernel.org
Subject: Re: cannot add device to partitioned raid6 array
In-Reply-To: message from Florian D. on Saturday March 31
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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