Re: RAID-6 corruption

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Followup to:  <20040729212046.GA27332@xxxxxx>
By author:    Jim Paris <jim@xxxxxxxx>
In newsgroup: linux.dev.raid
> 
> Hello,
> 
> (I've posted some messages about this to linux-raid, but haven't
> gotten much of a response; this time I'm cc'ing to linux-kernel)
> 

I haven't seen any of those messages, so this is the first case happening.

> I am seeing reproducible corruption with software RAID-6 on an array
> that has been created with missing disks.  The attached script
> demonstrates this easily through loopback devices, but I see the
> problem just the same on real drives.
> 
> I do not see the problem with full RAID-6 arrays (no missing disks),
> nor do I see it on RAID-5 arrays on the same system.  I haven't seen
> the corruption when writing directly to the md device, but I haven't
> tested that very much.
> 
> Tested on 2.6.6, 2.6.7, 2.6.8-rc2, with mdadm 1.5.0 and 1.6.0.
> See attached.

I will look at it.

	-hpa
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