Ceph: Difference between revisions
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rados Reliable Autonomic Distributed Object Store | rados Reliable Autonomic Distributed Object Store | ||
rbd Rados Block Device | rbd Rados Block Device | ||
pg Placement Groups | |||
=look at logs of rook= | =look at logs of rook= |
Revision as of 12:56, 16 August 2023
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 pg Placement Groups
look at logs of rook
Get pod
oc get pods -n openshift-storage -o name -l app=rook-ceph-operator
Look at logs from pod.
oc logs -n openshift-storage -o name -l app=rook-ceph-operator
versions
rook version ceph -v
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 biggest block devices
POOL=$(rados df | grep -vE '^total|^POOL|^$' | sort -k 4 -n | tail -1 | awk '{print $1}') ; 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
Print what to paste in shell in ceph pod
echo "Paste in pod: export CEPH_ARGS='-c /var/lib/rook/openshift-storage/openshift-storage.config'" ; oc rsh -n openshift-storage $(oc get pods -n openshift-storage -o name -l app=rook-ceph-operator)
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