"H. Peter Anvin" <hpa@xxxxxxxxx> writes:
> Andre Noll wrote:
>>
>>> So back to my original question: Why does the kernel require 4 disks
>>> for a raid6 instead of allowing 3?
>>
>> Dunno. Maybe Dan, Neil or HPA can tell the reason for imposing this
>> limitation.
>>
>
> It's very simple: it avoids an ugly corner case in the RAID-6
> computation code. Rather than inserting special code (and verifying it,
> etc.) to deal with the 3-disk RAID-6 degenerate case, it was easier to
> just not permit it.
>
> -hpa
Could you point me at the file/line where the corner case is?
MfG
Goswin
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