Firefly :) last release. After few days, second MDS is still "stopping" and consuming CPU sometimes... :) On 09/04/2014 09:13 AM, Yan, Zheng wrote: > 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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