Hi Greg, Restarting the actual service ie: service ceph restart osd.50, only takes a few seconds.
Attached is a ceph -w of just running a service ceph restart osd.50, You can see it marks itself down pretty much straight away. Takes a little while to mark itself as up and finish "recovery" If I do this to all 12 osd's the node goes crazy, It's almost like the node is cpu bound but it has 6 cores, and load average goes to 300+ http://pastie.org/pastes/8968950/text?key=0e0bs1ojbm2arnexn52iwq Regards, Quenten -----Original Message----- From: Gregory Farnum [mailto:g...@inktank.com] Sent: Wednesday, 26 March 2014 2:02 AM To: Quenten Grasso Cc: Kyle Bader; ceph-users@lists.ceph.com Subject: Re: [ceph-users] OSD Restarts cause excessively high load average and "requests are blocked > 32 sec" How long does it take for the OSDs to restart? Are you just issuing a restart command via upstart/sysvinit/whatever? How many OSDMaps are generated from the time you issue that command to the time the cluster is healthy again? This sounds like an issue we had for a while where OSDs would start peering before they had processed the maps they needed to look at; the fix might not have been backported to Emperor. But I'd like to be sure this isn't some other issue you're seeing. -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com On Sat, Mar 22, 2014 at 8:16 PM, Quenten Grasso <qgra...@onq.com.au> wrote: > Hi Kyle, > > Thanks, I turned on debug ms = 1 and debug osd = 10 and restarted osd.54 > heres here's log for that one. > > ceph-osd.54.log.bz2 > http://www67.zippyshare.com/v/99704627/file.html > > > Strace osd 53, > strace.zip > http://www43.zippyshare.com/v/17581165/file.html > > > Thanks, > Quenten > -----Original Message----- > From: Kyle Bader [mailto:kyle.ba...@gmail.com] > Sent: Sunday, 23 March 2014 12:10 PM > To: Quenten Grasso > Subject: Re: [ceph-users] OSD Restarts cause excessively high load average > and "requests are blocked > 32 sec" > >> Any ideas on why the load average goes so crazy & starts to block IO? > > Could you turn on "debug ms = 1" and "debug osd = 10" prior to restarting the > OSDs on one of your hosts and sharing the logs so we can take a look? > > It also might be worth while to strace one of the OSDs to try to determine > what it's working so hard on, maybe: > > strace -fc -p <osd pid> > strace.osd1.log > > Thanks! > > -- > > Kyle > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
