014 Ceph管理和自定义CRUSHMAP

2023-12-14 20:42:28

一、概念

1.1 Ceph集群写操作流程

client首先访问ceph monitor获取cluster map的一个副本，知晓集群的状态和配置

数据被转化为一个或多个对象，每个对象都具有对象名称和存储池名称

以PG数为基数做hash，将对象映射到一个PG

根据计算出的PG，再通过CRUSH算法得到存放数据的一组OSD位置（副本个数），第一个是主，后面是从

客户端获得OSD ID，直接和这些OSD通信并存放数据

注：以上所有操作都是在客户端完成的，不会影响ceph集群服务端性能

1.2 Crush和对象放置策略

Ceph使用CRUSH算法（Controlled Replication Under Scalable Hashing 可扩展哈希下的受控复制）来计算哪些OSD存放哪些对象

对象分配到PG中，CRUSH决定这些PG使用哪些OSD来存储对象。理想情况下，CRUSH会将数据均匀的分布到存储中

当添加新OSD或者现有的OSD出现故障时，Ceph使用CRUSH在活跃的OSD上重平衡数据

CRUSH map是CRUSH算法的*配置机制，可通过调整CRUSH map来优化数据存放位置

默认情况下，CRUSH将对象放置到不同主机上的OSD中。可以配置CRUSH map和CRUSH rules，使对象放置到不同房间或者不同机柜的主机上的OSD中。也可以将SSD磁盘分配给需要高速存储的池

1.3 Crush map的组成部分

CRUSH hierarchy（层次结构）：一个树型结构，通常用于代表OSD所处的位置。默认情况下，有一个根bucket，它包含所有的主机bucket，而OSD则是主机bucket的树叶。这个层次结构允许我们自定义，对它重新排列或添加更多的层次，如将OSD主机分组到不同的机柜或者不同的房间

CRUSH rule（规则）：CRUSH rule决定如何从bucket中分配OSD pg。每个池必须要有一条CRUSH rule，不同的池可map不同的CRUSH rule

二、crushmap的解译编译和更新

[root@ceph2 ceph]# ceph osd getcrushmap -o ./crushmap.bin

[root@ceph2 ceph]# file ./crushmap.bin

./crushmap.bin: MS Windows icon resource - 8 icons, 2-colors

[root@ceph2 ceph]# crushtool -d crushmap.bin -o ./crushmap.txt

[root@ceph2 ceph]# vim ./crushmap.txt

[root@ceph2 ceph]# crushtool -c crushmap.txt -o crushmap.-new.bin

[root@ceph2 ceph]# ceph osd tree

ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF 
-1 0.13129 root default 
-3 0.04376 host ceph2 
0 hdd 0.01459 osd.0 up 1.00000 1.00000 
3 hdd 0.01459 osd.3 up 1.00000 1.00000 
6 hdd 0.01459 osd.6 up 1.00000 1.00000 
-7 0.04376 host ceph3 
2 hdd 0.01459 osd.2 up 1.00000 1.00000 
5 hdd 0.01459 osd.5 up 1.00000 1.00000 
8 hdd 0.01459 osd.8 up 1.00000 1.00000 
-5 0.04376 host ceph4 
1 hdd 0.01459 osd.1 up 1.00000 1.00000 
4 hdd 0.01459 osd.4 up 1.00000 1.00000 
7 hdd 0.01459 osd.7 up 1.00000 1.00000

[root@ceph2 ceph]# vim ./crushmap.txt

# 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 chooseleaf_stable 1
tunable straw_calc_version 1
tunable allowed_bucket_algs 54

# devices
device 0 osd.0 class hdd
device 1 osd.1 class hdd
device 2 osd.2 class hdd
device 3 osd.3 class hdd
device 4 osd.4 class hdd
device 5 osd.5 class hdd
device 6 osd.6 class hdd
device 7 osd.7 class hdd
device 8 osd.8 class hdd

# 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
type 11 aaa
# buckets
host ceph2 {
id -3 # do not change unnecessarily
id -4 class hdd # do not change unnecessarily
# weight 0.044
alg straw2
hash 0 # rjenkins1
item osd.0 weight 0.015
item osd.3 weight 0.015
item osd.6 weight 0.015
}
host ceph4 {
id -5 # do not change unnecessarily
id -6 class hdd # do not change unnecessarily
# weight 0.044
alg straw2
hash 0 # rjenkins1
item osd.1 weight 0.015
item osd.4 weight 0.01

item osd.7 weight 0.015

}
host ceph3 {
        id -7                      # do not change unnecessarily  ，一个负整数，以便与存储设备id区分
        id -8 class hdd           # do not change unnecessarily
        # weight 0.044     
        alg straw2               #将pg map到osd时的算法，默认使用straw2
        hash 0  # rjenkins1      #每个bucket都有一个hash算法，目前Ceph支持rjenkins1算法，设为0即使用该算法
        item osd.2 weight 0.015  #一个bucket包含的其他bucket或者叶子
        item osd.5 weight 0.015
        item osd.8 weight 0.015
}
root default {
        id -1           # do not change unnecessarily
        id -2 class hdd         # do not change unnecessarily
        # weight 0.131
        alg straw2
        hash 0  # rjenkins1
        item ceph2 weight 0.044
        item ceph4 weight 0.044
        item ceph3 weight 0.044
}

# rules
rule replicated_rule {
        id 0
        type replicated
        min_size 1
        max_size 10
        step take default
        step chooseleaf firstn 0 type host
        step emit
}
rule EC-pool {
        id 1
        type erasure
        min_size 3
        max_size 5
        step set_chooseleaf_tries 5
        step set_choose_tries 100
        step take default
        step chooseleaf indep 0 type host
        step emit
}

# end crush map

crushmap.txt

配置项

host ceph3 {
        id -7                      # do not change unnecessarily  ，一个负整数，以便与存储设备id区分
        id -8 class hdd           # do not change unnecessarily
        # weight 0.044     
        alg straw2               #将pg map到osd时的算法，默认使用straw2
        hash 0  # rjenkins1      #每个bucket都有一个hash算法，目前Ceph支持rjenkins1算法，设为0即使用该算法
        item osd.2 weight 0.015  #一个bucket包含的其他bucket或者叶子
        item osd.5 weight 0.015
        item osd.8 weight 0.015
}

CRUSH map包含数据放置规则，默认有两个规则： replicated_rule和erasure-code

通过ceph osd crush rule ls可列出现有规则，也可以使用ceph osd crush rule dump打印规则详细详细

[root@ceph2 ceph]# ceph osd crush rule ls

[root@ceph2 ceph]# ceph osd crush rule dump

[
    {
        "rule_id": 0,
        "rule_name": "replicated_rule",
        "ruleset": 0,
        "type": 1,
        "min_size": 1,
        "max_size": 10,
        "steps": [
            {
                "op": "take",
                "item": -1,
                "item_name": "default"
            },
            {
                "op": "chooseleaf_firstn",
                "num": 0,
                "type": "host"
            },
            {
                "op": "emit"
            }
        ]
    },
    {
        "rule_id": 1,
        "rule_name": "EC-pool",
        "ruleset": 1,
        "type": 3,
        "min_size": 3,
        "max_size": 5,
        "steps": [
            {
                "op": "set_chooseleaf_tries",
                "num": 5
            },
            {
                "op": "set_choose_tries",
                "num": 100
            },
            {
                "op": "take",
                "item": -1,
                "item_name": "default"
            },
            {
                "op": "chooseleaf_indep",
                "num": 0,
                "type": "host"
            },
            {
                "op": "emit"
            }
        ]
    }
]

和配置文件crushmap一样

rule replicated_rule {
        id 0
        type replicated
        min_size 1
        max_size 10
        step take default
        step chooseleaf firstn 0 type host
        step emit
}
rule <rulename> {
id <id > [整数，规则id]
type [replicated|erasure] [规则类型，用于复制池还是纠删码池]
min_size <min-size> [如果池的最小副本数小于该值，则不会为当前池应用这条规则]
max_size <max-size>[如果创建的池的最大副本大于该值，则不会为当前池应用这条规则]
step take <bucket type> [这条规则作用的bucket，默认为default]
step [chooseleaf|choose] [firstn] <num> type <bucket-type> 
# num == 0 选择N（池的副本数）个bucket
# num > 0且num < N 选择num个bucket
# num < 0 选择N-num(绝对值)个bucket
step emit
}

创建一个复制池：

[root@ceph2 ceph]# ceph osd pool create testpool 32 32
pool 'testpool' already exists
[root@ceph2 ceph]# ceph osd pool set tetspool size 11
Error ENOENT: unrecognized pool 'tetspool'             #crush规则最大为10 修改crushrule

[root@ceph2 ceph]# vim crushmap.txt

rule replicated1_rule {
        id 2
        type replicated
        min_size 1
        max_size 11
        step take default
        step chooseleaf firstn 0 type host
        step emit
}

[root@ceph2 ceph]# vim crushmap.txt

[root@ceph2 ceph]# crushtool -c crushmap.txt -o crushmap-new.bin

[root@ceph2 ceph]# ceph osd setcrushmap -i crushmap-new.bin

[root@ceph2 ceph]# ceph osd crush rule ls

[root@ceph2 ceph]# ceph osd pool get testpool all

size: 3
min_size: 2
crash_replay_interval: 0
pg_num: 128
pgp_num: 128
crush_rule: replicated_rule
hashpspool: true
nodelete: false
nopgchange: false
nosizechange: false
write_fadvise_dontneed: false
noscrub: false
nodeep-scrub: false
use_gmt_hitset: 1
auid: 0
fast_read: 0

三、从命令行更新Crush map参数

3.1 默认bucket类型

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

图解

四、从命令行更新CRUSH map的层次结构

4.1 创建bucket

[root@ceph2 ceph]# ceph osd crush add-bucket DC1 datacenter
added bucket DC1 type datacenter to crush map

4.2 检查

[root@ceph2 ceph]# ceph osd getcrushmap -o crushmap.bin

[root@ceph2 ceph]# crushtool -d crushmap.bin -o crushmap.txt

[root@ceph2 ceph]# vim crushmap.txt

datacenter DC1 {
        id -9           # do not change unnecessarily
        # weight 0.000
        alg straw2
        hash 0  # rjenkins1
}

[root@ceph2 ceph]# ceph osd tree

4.3 删除

[root@ceph2 ceph]# vim crushmap.txt

这一段删除
datacenter DC1 {
        id -9           # do not change unnecessarily
        # weight 0.000
        alg straw2
        hash 0  # rjenkins1
}

4.4 编译导入

[root@ceph2 ceph]# crushtool -c crushmap.txt -o crushmap-new.bin

[root@ceph2 ceph]# ceph osd setcrushmap -i crushmap-new.bin

已经删除

[root@ceph2 ceph]# ceph osd tree

4.5 重新创建bucket

[root@serverc ~]# ceph osd crush add-bucket dc1 root
added bucket dc1 type root to crush map

五、规划新的bucket

5.1 定义三个rack

[root@ceph2 ceph]# ceph osd crush add-bucket  rack1 rack
added bucket rack1 type rack to crush map
[root@ceph2 ceph]# ceph osd crush add-bucket  rack2 rack
added bucket rack2 type rack to crush map
[root@ceph2 ceph]# ceph osd crush add-bucket  rack3 rack
added bucket rack3 type rack to crush map

5.2 把三个rack加入到dc1

[root@ceph2 ceph]# ceph osd crush  move rack1 root=dc1
moved item id -10 name 'rack1' to location {root=dc1} in crush map
[root@ceph2 ceph]# ceph osd crush  move rack2 root=dc1
moved item id -11 name 'rack2' to location {root=dc1} in crush map
[root@ceph2 ceph]# ceph osd crush  move rack3 root=dc1
moved item id -12 name 'rack3' to location {root=dc1} in crush map

5.3 把三个主机移动到rack中

由于move过去，默认就没有主机了，可以只用link连接过去

[root@ceph2 ceph]# ceph osd crush link ceph2 rack=rack1
linked item id -3 name 'ceph2' to location {rack=rack1} in crush map
[root@ceph2 ceph]# ceph osd crush link ceph2 rack=rack2
linked item id -3 name 'ceph2' to location {rack=rack2} in crush map
[root@ceph2 ceph]# ceph osd crush link ceph3 rack=rack2
linked item id -7 name 'ceph3' to location {rack=rack2} in crush map
[root@ceph2 ceph]# ceph osd crush link ceph4 rack=rack2
linked item id -5 name 'ceph4' to location {rack=rack2} in crush map

[root@ceph2 ceph]# ceph osd tree

5.4 修改

发现命令行配置错误，修改crushmap规则

原配置
rack rack1 {
        id -10          # do not change unnecessarily
        id -15 class hdd                # do not change unnecessarily
        # weight 0.045
        alg straw2
        hash 0  # rjenkins1
        item ceph2 weight 0.045
}
rack rack2 {
        id -11          # do not change unnecessarily
        id -14 class hdd                # do not change unnecessarily
        # weight 0.135
        alg straw2
        hash 0  # rjenkins1
        item ceph2 weight 0.045
        item ceph3 weight 0.045
        item ceph4 weight 0.045
}
rack rack3 {
        id -12          # do not change unnecessarily
        id -13 class hdd                # do not change unnecessarily
        # weight 0.000
        alg straw2
        hash 0  # rjenkins1
}

修改

rack rack1 {
        id -10          # do not change unnecessarily
        id -15 class hdd                # do not change unnecessarily
        # weight 0.045
        alg straw2
        hash 0  # rjenkins1
        item ceph2 weight 0.045
}
rack rack2 {
        id -11          # do not change unnecessarily
        id -14 class hdd                # do not change unnecessarily
        # weight 0.135
        alg straw2
        hash 0  # rjenkins1
        item ceph3 weight 0.045
}
rack rack3 {
        id -12          # do not change unnecessarily
        id -13 class hdd                # do not change unnecessarily
        # weight 0.000
        alg straw2
        hash 0  # rjenkins1
        item ceph4 weight 0.045
}

5.5 编译导入

[root@ceph2 ceph]# crushtool -c crushmap.txt -o crushmap-new.bin 
[root@ceph2 ceph]# ceph osd  setcrushmap -i crushmap-new.bin
29

[root@ceph2 ceph]# ceph osd tree

5.6 创建一个故障域为rack级别的rule

[root@ceph2 ceph]# ceph osd crush rule create-replicated indc1 dc1 rack

[root@ceph2 ceph]# ceph osd getcrushmap -o ./crushmap.bin

[root@ceph2 ceph]# crushtool -d ./crushmap.bin -o ./crushmap.txt

[root@ceph2 ceph]# vim ./crushmap.txt

rule indc1 {
        id 3
        type replicated
        min_size 1
        max_size 10
        step take dc1
        step chooseleaf firstn 0 type rack
        step emit
}

5.7 创建一个池检测

[root@ceph2 ceph]# ceph osd pool create test 32 32
pool 'test' created
[root@ceph2 ceph]# ceph osd pool application  enable  test  rbd
enabled application 'rbd' on pool 'test'
[root@ceph2 ceph]# ceph osd pool get  test all
size: 3
min_size: 2
crash_replay_interval: 0
pg_num: 32
pgp_num: 32
crush_rule: replicated_rule
hashpspool: true
nodelete: false
nopgchange: false
nosizechange: false
write_fadvise_dontneed: false
noscrub: false
nodeep-scrub: false
use_gmt_hitset: 1
auid: 0
fast_read: 0

5.8 修改crushmap规则

[root@ceph2 ceph]# ceph osd pool set test crush_rule indc1
set pool 16 crush_rule to indc1
[root@ceph2 ceph]# ceph osd pool get  test all
size: 3
min_size: 2
crash_replay_interval: 0
pg_num: 32
pgp_num: 32
crush_rule: indc1
hashpspool: true
nodelete: false
nopgchange: false
nosizechange: false
write_fadvise_dontneed: false
noscrub: false
nodeep-scrub: false
use_gmt_hitset: 1
auid: 0
fast_read: 0

5.9 创建一个对象测试

[root@ceph2 ceph]# rados -p test put test /etc/ceph/ceph.conf
[root@ceph2 ceph]# rados -p test ls
test
[root@ceph2 ceph]# ceph osd map test test
osdmap e239 pool 'test' (16) object 'test' -> pg 16.40e8aab5 (16.15) -> up ([5,6], p5) acting ([5,6,0], p5)
[root@ceph2 ceph]# cd  /var/lib/ceph/osd/ceph-0/current/
[root@ceph2 current]# ls
10.0_head  1.1f_head  13.5_head   14.20_head  1.48_head   15.26_head  1.53_head   15.5c_head  15.79_head  16.11_head  1.66_TEMP  1.79_head  5.2_head   6.5_head

六、实现指定ssd的存储池

每一个主机上选择一块磁盘作为ssd
ceph2：osd.0 ceph3:osd.2 ceph4:osd.1

6.1 创建基于这些主机的bucket

[root@ceph2 current]# ceph osd crush add-bucket ceph2-ssd host
added bucket ceph2-ssd type host to crush map
[root@ceph2 current]# ceph osd crush add-bucket ceph3-ssd host
added bucket ceph3-ssd type host to crush map
[root@ceph2 current]# ceph osd crush add-bucket ceph4-ssd host
added bucket ceph4-ssd type host to crush map

[root@ceph2 current]# ceph osd tree

6.2 创建root，并把三台主机添加进去

[root@ceph2 current]# ceph osd crush add-bucket ssd-root root
added bucket ssd-root type root to crush map
[root@ceph2 current]# ceph osd crush move ceph2-ssd root=ssd-root
moved item id -17 name 'ceph2-ssd' to location {root=ssd-root} in crush map
[root@ceph2 current]# ceph osd crush move ceph3-ssd root=ssd-root
moved item id -18 name 'ceph3-ssd' to location {root=ssd-root} in crush map
[root@ceph2 current]# ceph osd crush move ceph4-ssd root=ssd-root
moved item id -19 name 'ceph4-ssd' to location {root=ssd-root} in crush map

[root@ceph2 current]# ceph osd tree

6.3 在这些主机上只添加指定的ssd盘的osd

[root@ceph2 current]# ceph osd crush add osd.0 0.01500 root=ssd-root host=ceph2-ssd
add item id 0 name 'osd.0' weight 0.015 at location {host=ceph2-ssd,root=ssd-root} to crush map
[root@ceph2 current]# ceph osd crush add osd.2 0.01500 root=ssd-root host=ceph3-ssd
add item id 2 name 'osd.2' weight 0.015 at location {host=ceph3-ssd,root=ssd-root} to crush map
[root@ceph2 current]# ceph osd crush add osd.1 0.01500 root=ssd-root host=ceph4-ssd
add item id 1 name 'osd.1' weight 0.015 at location {host=ceph4-ssd,root=ssd-root} to crush map

[root@ceph2 current]# ceph osd tree

6.4 创建一个crush rule，故障域基于主机级别

[root@ceph2 current]# ceph osd crush rule create-replicated ssdrule ssd-root host

6.5 创建一个池检测

[root@ceph2 current]# ceph osd pool create ssdpool 32 32 replicated ssdrule
pool 'ssdpool' created
[root@ceph2 current]# ceph osd pool get ssdpool all
size: 3
min_size: 2
crash_replay_interval: 0
pg_num: 32
pgp_num: 32
crush_rule: ssdrule
hashpspool: true
nodelete: false
nopgchange: false
nosizechange: false
write_fadvise_dontneed: false
noscrub: false
nodeep-scrub: false
use_gmt_hitset: 1
auid: 0
fast_read: 0
[root@ceph2 current]# rados -p ssdpool put test  /etc/ceph/ceph.conf
[root@ceph2 current]# rados -p ssdpool ls
test
[root@ceph2 current]# ceph osd map ssdpool test
osdmap e255 pool 'ssdpool' (17) object 'test' -> pg 17.40e8aab5 (17.15) -> up ([2,1,0], p2) acting ([2,1,0], p2)

6.6 保证两个root不冲突

可以把指定的ssd从dc1的root中去掉，保证两个root各用个的磁盘

[root@ceph2 current]# cd /etc/ceph/

[root@ceph2 ceph]# ceph osd getcrushmap -o crushmap.bin

[root@ceph2 ceph]# crushtool -d crushmap.bin -o crushmap.txt

[root@ceph2 ceph]# vim crushmap.txt

host ceph2 {
        id -3           # do not change unnecessarily
        id -4 class hdd         # do not change unnecessarily
        # weight 0.045
        alg straw2
        hash 0  # rjenkins1
        #item osd.0 weight 0.015
        item osd.3 weight 0.015
        item osd.6 weight 0.015
}
host ceph4 {
        id -5           # do not change unnecessarily
        id -6 class hdd         # do not change unnecessarily
        # weight 0.045
        alg straw2
        hash 0  # rjenkins1
        #item osd.1 weight 0.015
        item osd.4 weight 0.015
        item osd.7 weight 0.015
}
host ceph3 {
        id -7           # do not change unnecessarily
        id -8 class hdd         # do not change unnecessarily
        # weight 0.045
        alg straw2
        hash 0  # rjenkins1
        #item osd.2 weight 0.015
        item osd.5 weight 0.015
        item osd.8 weight 0.015
}

[root@ceph2 ceph]# crushtool -c crushmap.txt -o crushmap-new.bin

[root@ceph2 ceph]# ceph osd setcrushmap -i crushmap-new.bin

[root@ceph2 ceph]# ceph osd tree

ID  CLASS WEIGHT  TYPE NAME          STATUS REWEIGHT PRI-AFF 
-20       0.04500 root ssd-root                              
-17       0.01500     host ceph2-ssd                         
  0   hdd 0.01500         osd.0          up  1.00000 1.00000 
-18       0.01500     host ceph3-ssd                         
  2   hdd 0.01500         osd.2          up  1.00000 1.00000 
-19       0.01500     host ceph4-ssd                         
  1   hdd 0.01500         osd.1          up  1.00000 1.00000 
 -9       0.17999 root dc1                                   
-10       0.04500     rack rack1                             
 -3       0.04500         host ceph2                         
  3   hdd 0.01500             osd.3      up  1.00000 1.00000 
  6   hdd 0.01500             osd.6      up  1.00000 1.00000 
-11       0.13499     rack rack2                             
 -7       0.04500         host ceph3                         
  5   hdd 0.01500             osd.5      up  1.00000 1.00000 
  8   hdd 0.01500             osd.8      up  1.00000 1.00000 
-12             0     rack rack3                             
 -5       0.04500         host ceph4                         
  4   hdd 0.01500             osd.4      up  1.00000 1.00000 
  7   hdd 0.01500             osd.7      up  1.00000 1.00000 
 -1       0.13197 root default                               
 -3       0.04399     host ceph2                             
  3   hdd 0.01500         osd.3          up  1.00000 1.00000 
  6   hdd 0.01500         osd.6          up  1.00000 1.00000 
 -7       0.04399     host ceph3                             
  5   hdd 0.01500         osd.5          up  1.00000 1.00000 
  8   hdd 0.01500         osd.8          up  1.00000 1.00000 
 -5       0.04399     host ceph4                             
  4   hdd 0.01500         osd.4          up  1.00000 1.00000 
  7   hdd 0.01500         osd.7          up  1.00000 1.00000

各个的osd位于不同的root中，实验完成！！！

博主声明：本文的内容来源主要来自誉天教育晏威老师，由本人实验完成操作验证，需要的博友请联系誉天教育（http://www.yutianedu.com/），获得官方同意或者晏老师（https://www.cnblogs.com/breezey/）本人同意即可转载，谢谢！

码农公寓

一、概念

1.1 Ceph集群写操作流程

1.2 Crush和对象放置策略

1.3 Crush map的组成部分

二、crushmap的解译编译和更新

三、从命令行更新Crush map参数

3.1 默认bucket类型

四、从命令行更新CRUSH map的 层次结构

4.2 检查

4.3 删除

4.4 编译导入

4.5 重新创建bucket

五、规划新的bucket

5.1 定义三个rack

5.2 把三个rack加入到dc1

5.3 把三个主机移动到rack中

5.4 修改

5.5 编译导入

5.6 创建一个故障域为rack级别的rule

5.7 创建一个池检测

5.8 修改crushmap规则

5.9 创建一个对象测试

六、 实现指定ssd的存储池

6.1 创建基于这些主机的bucket

6.2 创建root，并把三台主机添加进去

6.3 在这些主机上只添加指定的ssd盘的osd

6.4 创建一个crush rule，故障域基于主机级别

6.5 创建一个池检测

6.6 保证两个root不冲突

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四、从命令行更新CRUSH map的层次结构

六、实现指定ssd的存储池