On Thu, Oct 18, 2018 at 3:59 AM Florent B <florent@xxxxxxxxxxx> wrote: > > Hi, > I'm not running multiple active MDS (1 active & 7 standby). > I know about debug_mds 20, is it the only log you need to see bugs ? > > On 16/10/2018 18:32, Sergey Malinin wrote: > > Are you running multiple active MDS daemons? > > On MDS host issue "ceph-daemon mds.X config set debug_mds 20" for maximum logging verbosity. > > > >> On 16.10.2018, at 19:23, Florent B <florent@xxxxxxxxxxx> wrote: > >> > >> Hi, > >> > >> A few months ago I sent a message to that list about a problem with a > >> Ceph + Dovecot setup. > >> > >> Bug disappeared and I didn't answer to the thread. > >> > >> Now the bug has come again (Luminous up-to-date cluster + Dovecot > >> up-to-date + Debian Stretch up-to-date). > >> > >> I know how to reproduce it, but it seems very related to my user's > >> Dovecot data (few GB) and is related to file locking system (bug occurs > >> when I set locking method to "fcntl" or "flock" in Dovecot, but not with > >> "dotlock". > >> > >> It ends to a unresponsive MDS (100% CPU hang, switching to another MDS > >> but always staying at 100% CPU usage). I can't even use the admin socket > >> when MDS is hanged. > >> For issue like this, gdb is the most convenient way to debug. After finding where the buggy code is, set debug_mds=20 and restart mds, check the log to find how the bug was triggered. Regards Yan, Zheng > >> I would like to know *exactly* which information do you need to > >> investigate that bug ? (which commands, when, how to report large log > >> files...) > >> > >> Thank you. > >> > >> Florent > >> > >> > >> _______________________________________________ > >> ceph-users mailing list > >> ceph-users@xxxxxxxxxxxxxx > >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > > ceph-users mailing list > > ceph-users@xxxxxxxxxxxxxx > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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