Ceph 定制crush map
定制化crush map简单实验首先，查看原始osd目录树
# ceph osd tree
# id weighttype name up/down reweight
-1 3.24 root default
-5 1.08 rack rack1
-2 1.08 host bgw-os-node151
0 0.27 osd.0 up 1
1 0.27 osd.1 up 1
2 0.27 osd.2 up 1
3 0.27 osd.3 up 1
-6 1.08 rack rack2
-3 1.08 host bgw-os-node152
4 0.27 osd.4 up 1
5 0.27 osd.5 up 1
6 0.27 osd.6 up 1
7 0.27 osd.7 up 1
-7 1.08 rack rack3
-4 1.08 host bgw-os-node153
8 0.27 osd.8 up 1
9 0.27 osd.9 up 1
10 0.27 osd.10up 1
11 0.27 osd.11up 1
导出现有的crush map信息
# ceph osd getcrushmap -o crushmap.obj
got crush map from osdmap epoch 98
对导出的map文件进行反编译
# crushtool -d crushmap.obj -o decrushmap.obj
修改map信息
# vim decrushmap.obj #修改对象的权重,注意需要反编译后才能查看
# begin crush map
tunable choose_local_tries 0
tunable choose_local_fallback_tries 0
tunable choose_total_tries 50
tunable chooseleaf_descend_once 1
# devices
device 0 osd.0
device 1 osd.1
device 2 osd.2
device 3 osd.3
device 4 osd.4
device 5 osd.5
device 6 osd.6
device 7 osd.7
device 8 osd.8
device 9 osd.9
device 10 osd.10
device 11 osd.11
# types
type 0 osd
type 1 host
type 2 chassis
type 3 rack
type 4 row
type 5 pdu
type 6 pod
type 7 room
type 8 datacenter
type 9 region
type 10 root
# buckets
host bgw-os-node151 {
id -2 # do not change unnecessarily
# weight 1.080
alg straw
hash 0# rjenkins1
item osd.0 weight 0.270
item osd.1 weight 0.270
item osd.2 weight 0.270
item osd.3 weight 0.270
}
rack rack1 {
id -5 # do not change unnecessarily
# weight 1.080
alg straw
hash 0# rjenkins1
item bgw-os-node151 weight 1.080
}
host bgw-os-node152 {
id -3 # do not change unnecessarily
# weight 1.080
alg straw
hash 0# rjenkins1
item osd.4 weight 0.540
item osd.5 weight 0.540
item osd.6 weight 0.540
item osd.7 weight 0.540
}
rack rack2 {
id -6 # do not change unnecessarily
# weight 1.080
alg straw
hash 0# rjenkins1
item bgw-os-node152 weight 1.080
}
host bgw-os-node153 {
id -4 # do not change unnecessarily
# weight 1.080
alg straw
hash 0# rjenkins1
item osd.8 weight 0.360
item osd.9 weight 0.360
item osd.10 weight 0.360
item osd.11 weight 0.360
}
rack rack3 {
id -7 # do not change unnecessarily
# weight 1.080
alg straw
hash 0# rjenkins1
item bgw-os-node153 weight 1.080
}
root default {
id -1 # do not change unnecessarily
# weight 3.240
alg straw
hash 0# rjenkins1
item rack1 weight 1.080
item rack2 weight 1.080
item rack3 weight 1.080
}
# rules
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step chooseleaf firstn 0 type rack
step emit
}
# end crush map
对修改后的map信息进行编译
# crushtool -c decrushmap.obj -o crushnew.obj
根据新map信息重新设置crush map
# ceph osd setcrushmap -i crushnew.obj
查看新的osd目录树
# ceph osd tree #结果
# id weighttype name up/down reweight
-1 3.24 root default
-5 1.08 rack rack1
-2 1.08 host bgw-os-node151
0 0.27 osd.0 up 1
1 0.27 osd.1 up 1
2 0.27 osd.2 up 1
3 0.27 osd.3 up 1
-6 1.08 rack rack2
-3 1.08 host bgw-os-node152
4 0.54 osd.4 up 1
5 0.54 osd.5 up 1
6 0.54 osd.6 up 1
7 0.54 osd.7 up 1
-7 1.08 rack rack3
-4 1.08 host bgw-os-node153
8 0.36 osd.8 up 1
9 0.36 osd.9 up 1
10 0.36 osd.10up 1
11 0.36 osd.11up 1
上面可修该的内容还有很多，可根据具体的要求进行相应的修改。
参考：http://ceph.com/docs/master/rados/operations/crush-map/#crush-map-bucket-types
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