这篇文章给大家分享的是有关ceph如何实现指定OSD创建pool之class的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
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前面我们做指定osd创建pool本质是选择部分osd（假设为不同属性的osd）重新构建一个osd逻辑树，再针对新的逻辑树创建一个crush_rule，设置pool的crush_rule 就可以到达目的。但是后面发现还有一种更为方便的办法不需要单独创建逻辑树，只需要添加一个新的crush_rule 并对于到新的磁盘class（磁盘有多个class属性，子节点host就有多个class）。
[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
}
root default {
id -1 # do not change unnecessarily
id -2 class hdd # do not change unnecessarily
id -21 class ssd # do not change unnecessarily
# weight 0.354
alg straw2
hash 0 # rjenkins1
item ceph-node1 weight 0.059
item ceph-node2 weight 0.059
item ceph-node3 weight 0.059
item ceph-node4 weight 0.059
item ceph-node5 weight 0.059
item ceph-node6 weight 0.059
}
# rules
rule replicated_rule {
id 0
type replicated
min_size 1
max_size 10
step take default class hdd
step chooseleaf firstn 0 type host
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 host
step emit
}
后面在创建pool的时候选择新的crush_rule replicated_ssd
问题就解决了
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