Say I think my cephfs is slow when I rsync to it, slower than it used to 
be. First of all, I do not get why it reads so much data. I assume the 
file attributes need to come from the mds server, so the rsync backup 
should mostly cause writes not?

I think it started being slow, after enabling snapshots on the file 
system.

- how can I determine if mds_cache_memory_limit = 8000000000 is still 
correct?

- how can I test the mds performance from the command line, so I can 
experiment with cpu power configurations, and see if this brings a 
significant change?
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