Ceph
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what does it mean?
osd object storage daemon rados Reliable Autonomic Distributed Object Store rbd Rados Block Device
ceph
ceph df
Get du from block devices in pool named *rbd*
POOL=$(ceph osd pool ls | grep rbd) ; for i in $(rbd -p $POOL ls | xargs) ; do echo $POOL $i ; rbd -p $POOL du $i 2>/dev/null ; done