Hi list, During my test of ceph,I find sometime the whole ceph cluster are blocked and the reason was one unfunctional osd.Ceph can heal itself if some osd is down, but it seems if some osd is half dead (have heart beat but can't handle request) then all the request which are directed to that osd would be blocked. If all osds are in one pool and the whole cluster would be blocked due to that one hanged osd. I think this is because ceph will try to distribute the request to all osds and if one of the osd wont confirm the request is done then everything is blocked. Is there a way to let ceph to mark the the crippled osd down if the requests direct to that osd are blocked more than certain time to avoid the whole cluster is blocked?
2018-03-04 shadow_lin
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