one-liner getting block device from mounted osd

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I have a optimize script that I run after the reboot of a ceph node. It 
sets among other things /sys/block/sdg/queue/read_ahead_kb and 
/sys/block/sdg/queue/nr_requests of block devices being used for osd's. 
Normally I am using the mount command to discover these but with the 
tmpfs and ceph-volume this does not work. 

Is anyone able to share a simple onliner getting from osd's the used 
block devices? Eg from both types at the same time. Or do I really need 
to traverse this block -> /dev/mapper/... ?

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