转自：http://blog.csdn.net/signmem/article/details/50546919
最近在执行 ceph 扩容
注: 如果有条件, 建议不要扩容, 直接创建新 POOL, 这样会避免很多异常与影响
扩容每天大约 2T 空间, 扩容过程中, pg 会对数据执行自动迁移, 但在迁移过程中会遇到下面异常错误
[root@hh-yun-puppet-129021 ~] cluster dc4f91c1-8792-4948-b68f-2fcea75f53b9
health HEALTH_WARN 1 requests are blocked > 32 sec
monmap e3: 5 mons at {hh-yun-ceph-cinder015-128055=240.30.128.55:6789/0,hh-yun-ceph-cinder017-128057=240.30.128.57:6789/0,hh-yun-ceph-cinder024-128074=240.30.128.74:6789/0,hh-yun-ceph-cinder025-128075=240.30.128.75:6789/0,hh-yun-ceph-cinder026-128076=240.30.128.76:6789/0}, election epoch 216, quorum 0,1,2,3,4 hh-yun-ceph-cinder015-128055,hh-yun-ceph-cinder017-128057,hh-yun-ceph-cinder024-128074,hh-yun-ceph-cinder025-128075,hh-yun-ceph-cinder026-128076 osdmap e97975: 190 osds: 190 up, 190 in pgmap v13666786: 20544 pgs, 2 pools, 77479 GB data, 19508 kobjects 228 TB used, 426 TB / 654 TB avail 20542 active+clean 2 active+clean+scrubbing+deep
client io 47657 kB/s rd, 164 MB/s wr, 5406 op/s
注意: 1 requests are blocked > 32 sec 有可能是在数据迁移过程中, 用户正在对该数据块进行访问, 但访问还没有完成, 数据就迁移到别的 OSD 中, 那么就会导致有请求被 block, 对用户也是有影响的
解决方法
寻找 block 的请求
[root@hh-yun-puppet-129021 ~]# ceph health detail HEALTH_WARN 1 requests are blocked > 32 sec 1 ops are blocked > 33554.4 sec 1 ops are blocked > 33554.4 sec on osd.16 1 osds have slow requests
可以看到 osd.16 具有一个操作 block
解决方法
查询 osd 对应主机
[root@hh-yun-puppet-129021 ~]# ceph osd tree
# id weight type name up/down reweight
-1 598 root default -2 40 host hh-yun-ceph-cinder015-128055 0 4 osd.0 up 1
1 4 osd.1 up 1
2 4 osd.2 up 1
3 4 osd.3 up 1
4 4 osd.4 up 1
5 4 osd.5 up 1
6 4 osd.6 up 1
7 4 osd.7 up 1
8 4 osd.8 up 1
9 4 osd.9 up 1
-3 40 host hh-yun-ceph-cinder016-128056 10 4 osd.10 up 1
11 4 osd.11 up 1
12 4 osd.12 up 1
13 4 osd.13 up 1
14 4 osd.14 up 1
15 4 osd.15 up 1
16 4 osd.16 up 1
17 4 osd.17 up 1
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重启 osd
[root@hh-yun-ceph-cinder016-128056 ~]# /etc/init.d/ceph stop osd.16 Stopping Ceph osd.16 on hh-yun-ceph-cinder016-128056...kill 2799859...kill 2799859...done
[root@hh-yun-ceph-cinder016-128056 ~]# /etc/init.d/ceph start osd.16 create-or-move updated item name 'osd.16' weight 3.64 at location {host=hh-yun-ceph-cinder016-128056,root=default} to crush map
Starting Ceph osd.16 on hh-yun-ceph-cinder016-128056...
Running as unit run-3126361.service.
系统会对该 osd 执行 recovery 操作, recovery 过程中, 会断开 block request, 那么这个 request 将会重新请求 mon 节点, 并重新获得新的 pg map, 得到最新的数据访问位置, 从而解决上述问题
参考恢复后的状态
[root@hh-yun-puppet-129021 ~] cluster dc4f91c1-8792-4948-b68f-2fcea75f53b9
health HEALTH_OK monmap e3: 5 mons at {hh-yun-ceph-cinder015-128055=240.30.128.55:6789/0,hh-yun-ceph-cinder017-128057=240.30.128.57:6789/0,hh-yun-ceph-cinder024-128074=240.30.128.74:6789/0,hh-yun-ceph-cinder025-128075=240.30.128.75:6789/0,hh-yun-ceph-cinder026-128076=240.30.128.76:6789/0}, election epoch 216, quorum 0,1,2,3,4 hh-yun-ceph-cinder015-128055,hh-yun-ceph-cinder017-128057,hh-yun-ceph-cinder024-128074,hh-yun-ceph-cinder025-128075,hh-yun-ceph-cinder026-128076 osdmap e97981: 190 osds: 190 up, 190 in pgmap v13669826: 20544 pgs, 2 pools, 77488 GB data, 19510 kobjects 228 TB used, 426 TB / 654 TB avail 20541 active+clean 3 active+clean+scrubbing+deep
client io 21801 kB/s rd, 66461 kB/s wr, 2328 op/s
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