On Wednesday, June 11, 2014, Florent B <flor...@coppint.com> wrote: > Hi every one, > > Sometimes my MDS crashes... sometimes after a few hours, sometimes after > a few days. > > I know I could enable debugging and so on to get more information. But > if it crashes after a few days, it generates gigabytes of debugging data > that are not related to the crash. > > Is it possible to get just a crash dump when MDS is crashing, to see > what's wrong ?
You should be getting a backtrace regardless of what debugging levels are enabled, so I assume you mean having it dump out prior log lines when that happens. And indeed you can. Normally you specify something like debug mds =10 And that dumps out the log. You can instead specify two values, separated by a slash, and the daemon will take the time to generate all the log lines at the second value but only dump to disk the first value: debug mds = 0/10 That will put nothing in the log, but will generate debug output level 10 in a memory ring buffer (10000 entries), and dump it on a crash. You can do this with any debug setting. -Greg > > Thank you. > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com <javascript:;> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Software Engineer #42 @ http://inktank.com | http://ceph.com
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