這篇文章主要介紹ceph隔離級別的示例分析，文中介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們一定要看完！
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ceph的隔離級別默認(rèn)都是host級別，也就是說兩個(gè)副本不會同時(shí)落在同一個(gè)host 上的磁盤中。這樣就保證了有一臺機(jī)器故障不導(dǎo)致數(shù)據(jù)不可用。但是如果同時(shí)兩臺機(jī)器故障你呢？這就有可能數(shù)據(jù)丟失造成嚴(yán)重后果。甚至說遇到一個(gè)機(jī)架突然掉電那這個(gè)ceph機(jī)器都不可用。解決辦法就是提高隔離級別為機(jī)架、甚至為了避免重大自然災(zāi)害導(dǎo)致一個(gè)機(jī)房損壞是的數(shù)據(jù)丟失隔離級別可以提高到機(jī)房級別，甚至更高。
下面我們的例子就是隔離級別提高到機(jī)架級別。
重慶分公司
重慶分公司
[root@ceph-node1 opt]# cat decrushmap
# 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 ssd
device 2 osd.2 class hdd
device 3 osd.3 class ssd
device 4 osd.4 class hdd
device 5 osd.5 class ssd
device 6 osd.6 class hdd
device 7 osd.7 class hdd
device 8 osd.8 class hdd
device 9 osd.9 class hdd
device 10 osd.10 class hdd
device 11 osd.11 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
# buckets
host ceph-node1 {
id -3 # do not change unnecessarily
id -4 class hdd # do not change unnecessarily
id -15 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item osd.0 weight 0.029
item osd.1 weight 0.029
}
host ceph-node2 {
id -5 # do not change unnecessarily
id -6 class hdd # do not change unnecessarily
id -16 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item osd.2 weight 0.029
item osd.3 weight 0.029
}
host ceph-node3 {
id -7 # do not change unnecessarily
id -8 class hdd # do not change unnecessarily
id -17 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item osd.4 weight 0.029
item osd.5 weight 0.029
}
host ceph-node4 {
id -9 # do not change unnecessarily
id -10 class hdd # do not change unnecessarily
id -18 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item osd.6 weight 0.029
item osd.7 weight 0.029
}
host ceph-node5 {
id -11 # do not change unnecessarily
id -12 class hdd # do not change unnecessarily
id -19 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item osd.8 weight 0.029
item osd.9 weight 0.029
}
host ceph-node6 {
id -13 # do not change unnecessarily
id -14 class hdd # do not change unnecessarily
id -20 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item osd.10 weight 0.029
item osd.11 weight 0.029
}
# rack
rack rack01 {
id -101 # do not change unnecessarily
id -102 class hdd # do not change unnecessarily
id -103 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item ceph-node1 weight 0.058
item ceph-node2 weight 0.058
}
rack rack02 {
id -104 # do not change unnecessarily
id -105 class hdd # do not change unnecessarily
id -106 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item ceph-node3 weight 0.058
item ceph-node4 weight 0.058
}
rack rack03 {
id -107 # do not change unnecessarily
id -108 class hdd # do not change unnecessarily
id -109 class ssd # do not change unnecessarily
# weight 0.058
alg straw2
hash 0 # rjenkins1
item ceph-node5 weight 0.058
item ceph-node6 weight 0.058
}
root default {
id -110 # do not change unnecessarily
id -111 class hdd # do not change unnecessarily
id -112 class ssd # do not change unnecessarily
# weight 0.354
alg straw2
hash 0 # rjenkins1
item rack01 weight 0.118
item rack02 weight 0.118
item rack03 weight 0.118
}
# rules
rule replicated_rule {
id 0
type replicated
min_size 1
max_size 10
step take default class hdd
step chooseleaf firstn 0 type rack
step emit
}
rule replicated_ssd {
id 1
type replicated
min_size 1
max_size 10
step take default class ssd
step chooseleaf firstn 0 type rack
step emit
}
[root@ceph-node1 opt]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-110 0.35399 root default
-101 0.11800 rack rack01
-3 0.05800 host ceph-node1
0 hdd 0.02899 osd.0 up 1.00000 1.00000
1 ssd 0.02899 osd.1 up 1.00000 1.00000
-5 0.05800 host ceph-node2
2 hdd 0.02899 osd.2 up 1.00000 1.00000
3 ssd 0.02899 osd.3 up 1.00000 1.00000
-104 0.11800 rack rack02
-7 0.05800 host ceph-node3
4 hdd 0.02899 osd.4 up 1.00000 1.00000
5 ssd 0.02899 osd.5 up 1.00000 1.00000
-9 0.05800 host ceph-node4
6 hdd 0.02899 osd.6 up 1.00000 1.00000
7 hdd 0.02899 osd.7 up 1.00000 1.00000
-107 0.11800 rack rack03
-11 0.05800 host ceph-node5
8 hdd 0.02899 osd.8 up 1.00000 1.00000
9 hdd 0.02899 osd.9 up 1.00000 1.00000
-13 0.05800 host ceph-node6
10 hdd 0.02899 osd.10 up 1.00000 1.00000
11 hdd 0.02899 osd.11 up 1.00000 1.00000測試發(fā)現(xiàn)達(dá)到效果
[root@ceph-node1 opt]# ceph osd map stat rbd_data.10ab6b8b4567.0000000000000042 osdmap e73 pool 'stat' (1) object 'rbd_data.10ab6b8b4567.0000000000000042' -> pg 1.fa3e81bf (1.3f) -> up ([11,2,4], p11) acting ([11,2,4], p11) # pg的3個(gè)副本分別放在了不同rack上
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