Ceph 启动后一直 active+undersized+degraded,求点醒.

[kofj]

第一次接触Ceph,已经实验了两天,具体多少次记不清了,大多数情况一启动起来都是这个状态.看了很多邮件列表,一直没找到解决方法.原因不明...

vagrant中部署的

[root@ceph1 ~]# ceph -v
ceph version 0.87.1 (283c2e7cfa2457799f534744d7d549f83ea1335e)


系统信息
```
[root@ceph1 ~]# cat /etc/issue
CentOS release 6.6 (Final)
Kernel \r on an \m

[root@ceph1 ~]# uname -a
Linux ceph1 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

ceph.conf配置文件

[global]
auth service required = cephx
auth client required = cephx
auth cluster required = cephx
auth supported = none

filestore_xattr_use_omap = true # Just 4 ext4
chooseleaf = 0

fsid = a1115100-85e8-405d-8b36-35d2428bab46
osd pool default size = 2
osd pool default min size = 1

[mon]
mon data = /var/lib/ceph/mon/$name

[mon.a]
host = ceph1
mon addr = 192.168.251.100:6789

[osd]
osd journal size = 1024
osd journal = /var/lib/ceph/osd/$name/journal
osd data = /var/lib/ceph/osd/$name

[osd.0]
host = ceph1

[osd.1]
host = ceph1

ceph 信息

[root@ceph1 ~]# ceph osd tree

id weight type name up/down reweight

-1 0.4 root default
-2 0 host ceph
-3 0.4 host ceph1
0 0.2 osd.0 up 1

1 0.2 osd.1 up 1
```

[root@ceph1 ~]# ceph -s
    cluster a1115100-85e8-405d-8b36-35d2428bab46
     health HEALTH_WARN 64 pgs degraded; 64 pgs stuck degraded; 64 pgs stuck unclean; 64 pgs stuck undersized; 64 pgs undersized
     monmap e1: 1 mons at {a=192.168.251.100:6789/0}, election epoch 1, quorum 0 a
     osdmap e25: 3 osds: 2 up, 2 in
      pgmap v47: 64 pgs, 1 pools, 0 bytes data, 0 objects
            6399 MB used, 8906 MB / 16124 MB avail
                  64 active+undersized+degraded

[bfti]

现在用ceph的企业多么?

[kofj]

@bfti 这个不太清楚.

[feicheche]

因为你有3个osd，但只有2个up，看看是不是有一个osd没有启动。

[xanpeng]

好久没看了。猜测可能的原因：1) feicheche说的 "3 osds: 2 up, 2in"; 2) 貌似默认3副本，要求跨host，osd够host不够仍会HEALTH_WARN。

[resettarget]

我看也是OSD问题，至少要有3个 OSD active，才能HEALTH_OK