Additional info:

Trying this with a bog-standard replicated pool

(ceph osd pool create reppool 2048 2048)

succeeds perfectly.

So, I assume the issue is the write-amplification from the ec pool 
implementation? 
My current settings are k=10, m=2

Reading in the list, there are additional suggestions about setting k to 
powers-of-two (which aren't well documented in the official docs...).
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