On Thu, 09 Jan 2014 09:03:37 +0100 Gionatan Danti [off-list ref] wrote:

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Interesting. Two question:
1) from which kernel the layout is the one depicted by Wikipedia?

Exactly what depiction in wikipedia are you referring to?  A link to the
image might help.

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2) it is possible, using mdadm, check what "far" layout is in use?

mdadm --detail /dev/mdWHATEVER | grep Layout

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I cannot answer that. Neil Brown should know.

Best regards
Keld
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Hi all,
anyone with an update on these two questions?

I was thinking to use the kernel block trace facility to track disk 
access and infer the on-disk data structure, but I haven't tried for now.

On the other hand, I carefully looked at mdadm output, without finding 
anything related to physical block placing.

Look for "Layout".

NeilBrown

Any new advices on that regard?
Thanks.