Hi all,
Context:
Firefly 0.80.9
Ubuntu 14.04.1
Almost a production platform in an openstack environment
176 OSD (SAS and SSD), 2 crushmap-oriented storage classes , 8 servers in 2 rooms, 3 monitors on openstack controllers
Usage: Rados Gateway for object service and RBD as back-end for Cinder and Glance
The Ceph cluster was installed by Mirantis procedures (puppet/fuel/ceph-deploy):
I noticed that tunables were curiously set.
ceph osd crush show-tunables ==>
{ "choose_local_tries": 0,
"choose_local_fallback_tries": 0,
"choose_total_tries": 50,
"chooseleaf_descend_once": 1,
"chooseleaf_vary_r": 1,
"straw_calc_version": 1,
"profile": "unknown",
"optimal_tunables": 0,
"legacy_tunables": 0,
"require_feature_tunables": 1,
"require_feature_tunables2": 1,
"require_feature_tunables3": 1,
"has_v2_rules": 0,
"has_v3_rules": 0}
I tried to update them
ceph osd crush tunables optimal ==>
adjusted tunables profile to optimal
But when checking
ceph osd crush show-tunables ==>
{ "choose_local_tries": 0,
"choose_local_fallback_tries": 0,
"choose_total_tries": 50,
"chooseleaf_descend_once": 1,
"chooseleaf_vary_r": 1,
"straw_calc_version": 1,
"profile": "unknown",
"optimal_tunables": 0,
"legacy_tunables": 0,
"require_feature_tunables": 1,
"require_feature_tunables2": 1,
"require_feature_tunables3": 1,
"has_v2_rules": 0,
"has_v3_rules": 0}
Nothing has changed.
I finally did
ceph osd crush set-tunable straw_calc_version 0
and
ceph osd crush show-tunables ==>
{ "choose_local_tries": 0,
"choose_local_fallback_tries": 0,
"choose_total_tries": 50,
"chooseleaf_descend_once": 1,
"chooseleaf_vary_r": 1,
"straw_calc_version": 0,
"profile": "firefly",
"optimal_tunables": 1,
"legacy_tunables": 0,
"require_feature_tunables": 1,
"require_feature_tunables2": 1,
"require_feature_tunables3": 1,
"has_v2_rules": 0,
"has_v3_rules": 0}
It's OK
My question:
Does the "ceph osd crush tunables <profile>" command change all the requested parameters in order to set the tunables to the right profile?
Brgds
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