raid10 offset distance

[Phillip Susi <psusi@ubuntu.com>]

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md(4) hints that you can get sequential read performance near that of
the far layout with the offset layout and a large chunk size.  That
sounded nice and I thought that chunk size was just the number of
stripes to write before the backup copy.  It turns out that "chunk
size" is really just the stripe factor, and so using a very large
stripe factor hurts performance since even a relatively large IO
doesn't span disks.

Is there a way to keep a sane stripe factor, but have the offset copy
stored further away to reduce seeking during sequential reads?

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