8.查看Ceph CRUSH map

                                                   查看Ceph CRUSH map

查看CRUSH map

    从monitor节点上获取CRUSH map

    [root@ceph ceph]# ceph osd getcrushmap -o crushmap_compiled_file


    反编译CRUSH map

    [root@ceph ceph]# crushtool -d crushmap_compiled_file -o crushmap_decompiled_file


    修改完成后，我们需要编译他

    [root@ceph ceph]# crushtool -d crushmap_decompiled_file -o newcrushmap


    将新CRUSH map导入集群中

    [root@ceph ceph]# ceph osd setcrushmap -i newcrushmap

    [root@ceph ceph]# cat crushmap_decompiled_file

# begin crush map
tunable choose_local_tries 0
tunable choose_local_fallback_tries 0
tunable choose_total_tries 50
tunable chooseleaf_descend_once 1
tunable chooseleaf_vary_r 1
tunable straw_calc_version 1

# devices
device 0 osd.0
device 1 osd.1
device 2 osd.2

# 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 ceph-node1 {
    id -2        # do not change unnecessarily
    # weight 0.000
    alg straw
    hash 0    # rjenkins1
}
host ceph {
    id -3        # do not change unnecessarily
    # weight 0.044
    alg straw
    hash 0    # rjenkins1
    item osd.2 weight 0.015
    item osd.1 weight 0.015
    item osd.0 weight 0.015
}
root default {
    id -1        # do not change unnecessarily
    # weight 0.044
    alg straw
    hash 0    # rjenkins1
    item ceph-node1 weight 0.000
    item ceph weight 0.044
}

# rules
rule replicated_ruleset {
    ruleset 0   #rule编号
    type replicated   
#定义pool类型为replicated(还有esurecode模式)

    min_size 1        
#pool中最小指定的副本数量不能小1

    max_size 10  
          #pool中最大指定的副本数量不能大于10

    step take default
#定义pg查找副本的入口点

    step chooseleaf firstn 0 type host
 #选叶子节点、深度优先、隔离host

    step emit  
#结束


}

# end crush map