Hello RBD users,

Would you mind running this command on a random OSD on your RBD-oriented 
cluster?

ceph-objectstore-tool \
 --data-path /var/lib/ceph/osd/ceph-NNN \
 
'["meta",{"oid":"snapmapper","key":"","snapid":0,"hash":2758339587,"max":0,"pool":-1,"namespace":"","max":0}]'
 \
 list-omap | wc -l

...and share the number of lines along with the overall size and 
utilization % of the OSD?  The OSD needs to be stopped, then run that 
command, then start it up again.

I'm trying to guage how much snapmapper metadata there is in a "typical" 
RBD environment.  If you have some sense of whether your users make 
relatively heavy or light use of snapshots, that would be helpful too!

Thanks!
sage
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