It’s printed in the OSD log at startup.

I don’t immediately see it in `ceph osd metadata` ; arguably it should be 
there.  `config show` on the admin socket I suspect does not show the existing 
value.

> 
> Hi,
> 
> Ceph 16 Pacific introduced a new smaller default min_alloc_size of 4096 bytes 
> for HDD and SSD OSDs.
> 
> How can I get the current min_allloc_size of OSDs that were created with 
> older Ceph versions? Is there a command that shows this info from the on disk 
> format of a bluestore OSD?
> 
> Regards
> -- 
> Robert Sander
> Heinlein Support GmbH
> Schwedter Str. 8/9b, 10119 Berlin
> 
> https://www.heinlein-support.de
> 
> Tel: 030 / 405051-43
> Fax: 030 / 405051-19
> 
> Amtsgericht Berlin-Charlottenburg - HRB 93818 B
> Geschäftsführer: Peer Heinlein - Sitz: Berlin
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