# ceph osd crush tree
ID CLASS WEIGHT TYPE NAME
-1 3.63835 root default
-9 0.90959 pod group1
-5 0.90959 host feather1
1 hdd 0.90959 osd.1
-10 2.72876 pod group2
-7 1.81918 host ds1
2 hdd 0.90959 osd.2
3 hdd 0.90959 osd.3
-3 0.90958 host feather0
0 hdd 0.90958 osd.0
And I've made a rule
# ceph osd crush rule dump pods
{
"rule_id": 1,
"rule_name": "pods",
"ruleset": 1,
"type": 1,
"min_size": 1,
"max_size": 10,
"steps": [
{
"op": "take",
"item": -1,
"item_name": "default"
},
{
"op": "chooseleaf_firstn",
"num": 0,
"type": "pod"
},
{
"op": "emit"
}
]
}
1. Assign device class to your crush rule:
ceph osd crush rule create-replicated pods default pod hdd
2. Your crush is imbalanced:
*good*:
root:
host1:
- osd0
host2:
- osd1
host3:
- osd3
*bad*:
root:
host1:
- osd0
host2:
- osd1
- osd2
- osd3
k
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