Important Commands

show current evaluations

./bin/ceph balancer eval-verbose

set max deviation for pgs

./bin/ceph config get mgr mgr/balancer/upmap_max_deviation
./bin/ceph config set mgr mgr/balancer/upmap_max_deviation [value]

show osd maps

./bin/ceph osd dump -f json-pretty

turn balancer off/on

./bin/ceph balancer off
./bin/ceph balancer on

show numbers assigned to pool

./bin/ceph osd lspools

shows the movement of pgs

pg dump pgs_brief
pg dump pgs_brief | grep “2/.”

moves the objects around

./bin/ceph osd pg-upmap-items

restarting mgr to retest code

./bin/init-ceph restart mgr.x