which version of MDS are you using? On Wed, Sep 3, 2014 at 10:48 PM, Florent Bautista <florent at coppint.com> wrote: > Hi John and thank you for your answer. > > I "solved" the problem doing : ceph mds stop 1 > > So one MDS is marked as "stopping". A few hours later, it is still > "stopping" (active process, consuming CPU sometimes). > > So the other seems to respond fine to clients... > > Multi-MDS is really really really unstable :-D > > On 09/03/2014 04:00 PM, John Spray wrote: >> Hi Florent, >> >> The first thing to do is to turn up the logging on the MDS (if you >> haven't already) -- set "debug mds = 20" >> http://ceph.com/docs/master/rados/troubleshooting/log-and-debug/#subsystem-log-and-debug-settings >> >> Since you say they appear as 'active' in "ceph status", I assume they >> are running rather than crashing again, but it would be good to log >> into the MDS servers and check that there really are running ceph-mds >> processes. If the MDS daemons are running but apparently >> unresponsive, you may be able to get a little bit of extra info from >> the running MDS by doing "ceph daemon mds.<name> <command>", where >> interesting commands are dump_ops_in_flight, status, objecter_ops >> >> Hopefully that will give us some clues. >> >> Cheers, >> John >> >> On Wed, Sep 3, 2014 at 11:52 AM, Florent Bautista >> <bautista.florent at gmail.com> wrote: >>> Hi everyone, >>> >>> I use Ceph Firefly release. >>> >>> I had a MDS cluster with only one MDS until yesterday, when I tried to add a >>> second one to test multi-mds. I thought I could get back to one MDS when I >>> want, but it seems we can't ! >>> >>> Both crashed this night, and I am unable to get them back today. >>> >>> They appear as active in ceph -s, clients using 3.16 kernel mount it but no >>> operation can be done : "ls" is freezing, load average of client is climbing >>> and nothing is done by MDSes (not using CPU, nothing in logs except some >>> "mdsload" messages and after some time : closing stale session client). >>> >>> How can I do to debug this situation and recover my data ? >>> >>> Thank you a lot. >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users at lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> _______________________________________________ >> ceph-users mailing list >> ceph-users at lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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