> And bluestore should refuse to start if the configured limit is > 4GB.  Or 
> something along those lines...

Just on this point - Bluestore OSDs will fail to start with an 
osd_max_object_size >=4GB with a helpful error message about the Bluestore hard 
limit. I was mildly amused when I discovered that luminous OSDs can start with 
osd_max_object_size = 4GB - 1 byte, but mimic OSDs require it to be <= 4GB - 2 
bytes to start without an error. I haven't checked to see if nautilus OSDs 
require <= 4GB - 3 bytes yet.

Cheers,
Tom
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