what does it mean?
crush Ceph’s placement algorithm (Controlled Replication Under Scalable Hashing)
osd object storage daemon
rados Reliable Autonomic Distributed Object Store
rbd Rados Block Device
ceph
Status of ceph
ceph -s
Disk usage
ceph df
Check placement group stats
ceph pg dump
every OSD and also the class, weight, status, which node it’s in, and any reweight or priority.
ceph osd tree
Create or remove OSDs
ceph osd create
ceph osd rm
Create or delete a storage pool
ceph osd pool create
ceph osd pool delete
Repair an OSD
ceph osd repair
Benchmark an OSD
ceph tell osd.* bench
List cluster keys
ceph auth list
ceph attributes about pool
osd pool ls detail
Info about crush
osd crush rule dump
ceph versions
ceph versions
how is data placed
ceph pg dump osds
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
access ceph in odf
oc rsh -n openshift-storage $(oc get pods -n openshift-storage -o name -l app=rook-ceph-operator)
export CEPH_ARGS='-c /var/lib/rook/openshift-storage/openshift-storage.config'
list osd pools
ceph osd pool ls
ceph osd pool autoscale-status
ceph config dump
# disable autoscaling
ceph osd pool ls | while read i ; do echo '*' $i ; ceph osd pool set $i pg_autoscale_mode off ; done
# Look to see how much data is being used for pg:s.
# Number of PGLog Entries, size of PGLog data in megabytes, and Average size of each PGLog item
for i in 0 1 2 ; do echo '*' $i ; osdid=$i ; ceph tell osd.$osdid dump_mempools | jq -r '.mempool.by_pool.osd_pglog | [ .items, .bytes /1024/1024, .bytes / .items ] | @csv' ;done
ceph df