rbd cache command thru admin socket

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I was following the instructions in
 https://www.sebastien-han.fr/blog/2015/09/02/ceph-validate-that-the-rbd-cache-is-active/

because I wanted to look at some of the rbd cache state and possibly flush and invalidate it

My ceph.conf has
[client]
        rbd default features = 1
        rbd default format = 2
        admin socket = /var/run/ceph/$cluster-$type.$id.$pid.$cctid.asok
        log file = /var/log/ceph/

I have a client only node (no osds) and on that node I ran fio with the librbd engine, which worked fine.  But I did not see anything in /var/run/ceph on that client node.  Is there something else I have to do?

-- Tom Deneau, AMD


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