does chunksize matter in raid-1?

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Does chunk size matter *at all* for RAID-1?

mdadm --create /dev/md0 --level=1 --chunk=8 /dev/sdc1 /dev/sdd1   
mdadm --create /dev/md0 --level=1 --chunk=128 /dev/sdc1 /dev/sdd1

In my mental model of how RAID works, it can't possibly matter
what my chunk size is whether I've got 1KB files or 1GB files because
no striped reading occurs. 

Is my mental model wrong?

-Jeff
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