ceph如何实现指定OSD创建pool之class

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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 maptunable choose_local_tries 0tunable choose_local_fallback_tries 0tunable choose_total_tries 50tunable chooseleaf_descend_once 1tunable chooseleaf_vary_r 1tunable chooseleaf_stable 1tunable straw_calc_version 1tunable allowed_bucket_algs 54# devicesdevice 0 osd.0 class hdddevice 1 osd.1 class ssddevice 2 osd.2 class hdddevice 3 osd.3 class ssddevice 4 osd.4 class hdddevice 5 osd.5 class ssddevice 6 osd.6 class hdddevice 7 osd.7 class hdddevice 8 osd.8 class hdddevice 9 osd.9 class hdddevice 10 osd.10 class hdddevice 11 osd.11 class hdd# typestype 0 osdtype 1 hosttype 2 chassistype 3 racktype 4 rowtype 5 pdutype 6 podtype 7 roomtype 8 datacentertype 9 regiontype 10 root# bucketshost 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}# rulesrule 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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