On Mon, Oct 14, 2019 at 01:40:19PM +0200, Harald Staub wrote: > Probably same problem here. When I try to add another MON, "ceph > health" becomes mostly unresponsive. One of the existing ceph-mon > processes uses 100% CPU for several minutes. Tried it on 2 test > clusters (14.2.4, 3 MONs, 5 storage nodes with around 2 hdd osds > each). To avoid errors like "lease timeout", I temporarily increase > "mon lease", from 5 to 50 seconds. > > Not sure how bad it is from a customer PoV. But it is a problem by > itself to be several minutes without "ceph health", when there is an > increased risk of losing the quorum ...
Hi Harry, thanks a lot for your reply! not sure we're experiencing the same issue, i don't have it on any other cluster.. when this is happening to you, does only ceph health stop working, or it also blocks all clients IO? BR nik > > Harry > > On 13.10.19 20:26, Nikola Ciprich wrote: > >dear ceph users and developers, > > > >on one of our production clusters, we got into pretty unpleasant situation. > > > >After rebooting one of the nodes, when trying to start monitor, whole cluster > >seems to hang, including IO, ceph -s etc. When this mon is stopped again, > >everything seems to continue. Traying to spawn new monitor leads to the same > >problem > >(even on different node). > > > >I had to give up after minutes of outage, since it's unacceptable. I think > >we had this > >problem once in the past on this cluster, but after some (but much shorter) > >time, monitor > >joined and it worked fine since then. > > > >All cluster nodes are centos 7 machines, I have 3 monitors (so 2 are now > >running), I'm > >using ceph 13.2.6 > > > >Network connection seems to be fine. > > > >Anyone seen similar problem? I'd be very grateful for tips on how to debug > >and solve this.. > > > >for those interested, here's log of one of running monitors with debug_mon > >set to 10/10: > > > >https://storage.lbox.cz/public/d258d0 > > > >if I could provide more info, please let me know > > > >with best regards > > > >nikola ciprich > > > > > > > > > > > > > > > -- ------------------------------------- Ing. Nikola CIPRICH LinuxBox.cz, s.r.o. 28. rijna 168, 709 00 Ostrava tel.: +420 591 166 214 fax: +420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: ser...@linuxbox.cz -------------------------------------
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