Normal disks also have a default 128kb readahead, not 4 MB, which seems
to be quite sufficient.  I don't see why you want the dm device layered
on top of the physical disks doing MORE readahead, let alone 4 MB worth.
If the setting given to lvchange is not respected though, that is a bug.

-- 
very sub-optimal default readahead settings on device and unused readahead 
setting in LVM
https://bugs.launchpad.net/bugs/129488
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