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CEPH performance monitoring

basic info

ceph

ceph -s
ceph -w
ceph df
ceph osd df tree

rados

rados df

Where:

  • USED COMPR: amount of space allocated for compressed data (i.e. this includes comrpessed data plus all the allocation, replication and erasure coding overhead).
  • UNDER COMPR: amount of data passed through compression (summed over all replicas) and beneficial enough to be stored in a compressed form.

RBD Rados Block Device

rbd ls
rbd du

perf

ceph iostat
 
ceph osd perf
 
rbd perf image iostat  # and wait 30 sec
rbd perf image iotop   # and wait 30 sec
 
rbd du

https://ceph.io/community/new-mimic-iostat-plugin/

rados benchmark

ceph osd pool create test
rados -p test bench 10 write --no-cleanup
rados -p test bench 10 seq
rados -p test bench -t 4 10 seq
rados -p test bench 10 rand
rados -p test cleanup

rbd benchmark

https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/1.3/html/administration_guide/benchmarking_performance#block_device