I've found that it helps to shut down the osds before shutting down the host. Especially if the node is also a monitor. It seems that some OSD shutdown messages get lost while monitors are holding elections.
On Tue, Dec 2, 2014 at 10:10 AM, Christoph Adomeit < christoph.adom...@gatworks.de> wrote: > Hi there, > > I have a giant cluster with 60 OSDs on 6 OSD Hosts. > > Now I want to do maintenance on one of the OSD Hosts. > > The documented Procedure is to "ceph osd set noout" and then shutdown > the OSD Node for maintenance. > > However, as soon as I even shut down 1 OSD I get around 200 slow requests > and the number of slow requests is growing for minutes. > > The test was done at night with low IOPS and I was expecting the cluster > to handle this condition much better. > > Is there some way of a more graceful shutdown of OSDs so that I can prevent > those slow requests ? I suppose it takes some time until monitor gets > notified that an OSD was shutdown. > > Thanks > Christoph > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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