osd pool erasure code stripe width

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I am trying to understand the use of "osd pool erasure code stripe width"
For example, I have a single-node system with a k=2,m=1 ec pool
and I write a single 40M object to this pool using rados bench.
But when I look on the disk, I still see only the 3 20M pieces for this object.
Where does the striping get used?

-- Tom Deneau, AMD


Description:
Sets the desired size, in bytes, of an object stripe on every erasure coded pools. Every object if size S will be stored as N stripes and each stripe will be encoded/decoded individually.
Type:
Unsigned 32-bit Integer
Default:
4096


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