ceph隔离级别的示例分析
这篇文章主要介绍ceph隔离级别的示例分析,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
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ceph的隔离级别默认都是host级别,也就是说两个副本不会同时落在同一个host 上的磁盘中。这样就保证了有一台机器故障不导致数据不可用。但是如果同时两台机器故障你呢?这就有可能数据丢失造成严重后果。甚至说遇到一个机架突然掉电那这个ceph机器都不可用。解决办法就是提高隔离级别为机架、甚至为了避免重大自然灾害导致一个机房损坏是的数据丢失隔离级别可以提高到机房级别,甚至更高。
下面我们的例子就是隔离级别提高到机架级别。
[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
测试发现达到效果
[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个副本分别放在了不同rack上
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