On Tue, 9 Sep 2014, yuelongguang wrote:
> hi,all
>
> that is crazy.
> 1.
> all my osds are down, but ceph -s tells they are up and in. why?
Peer OSDs normally handle failure detection. If all OSDs are down,
there is nobody to report the failures.
After 5 or 10 minutes if the OSDs don't report any stats to the monitor it
will eventually assume they are dead and mark them down.
> 2.
> now all osds are down, a vm is using rbd as its disk, and inside vm fio is
> r/wing the disk , but it hang ,can not be killed. why ?
The IOs will block indefinitely until the cluster is available. Once
the OSDs are started teh VM will become responsive again.
sage
>
> thanks
>
> [root@cephosd2-monb ~]# ceph -v
> ceph version 0.81 (8de9501df275a5fe29f2c64cb44f195130e4a8fc)
>
> [root@cephosd2-monb ~]# ceph -s
> cluster 508634f6-20c9-43bb-bc6f-b777f4bb1651
> health HEALTH_WARN mds 0 is laggy
> monmap e13: 3 mons
> at{cephosd1-mona=10.154.249.3:6789/0,cephosd2-monb=10.154.249.4:6789/0,cephos
> d3-monc=10.154.249.5:6789/0}, election epoch 154, quorum 0,1,2
> cephosd1-mona,cephosd2-monb,cephosd3-monc
> mdsmap e21: 1/1/1 up {0=0=up:active(laggy or crashed)}
> osdmap e196: 5 osds: 5 up, 5 in
> pgmap v21836: 512 pgs, 5 pools, 3115 MB data, 805 objects
> 9623 MB used, 92721 MB / 102344 MB avail
> 512 active+clean
>
>
>
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