On Thu, Dec 12, 2019 at 11:46:19PM +0000, Bryan Stillwell <bstillw...@godaddy.com> wrote: > On our test cluster after upgrading to 14.2.5 I'm having problems with the > mons pegging a CPU core while moving data around. I'm currently converting > the OSDs from FileStore to BlueStore by marking the OSDs out in multiple > nodes, destroying the OSDs, and then recreating them with ceph-volume lvm > batch. This seems too get the ceph-mon process into a state where it pegs a > CPU core on one of the mons:
I had a similar issue in a partially virtualized test cluster with 14.2.4 when I removed many OSDs. I resovled it either by adding more RAM to the MON VMs or by restarting the MONs multiple times. The VM changed from 2gb -> 4gb. ceph-mon in this small test cluster normally uses around 100-200mb; during the issue it used (at least) 1.7gb for a short time. I can't tell you exactly which of the two resolved it since adding more RAM to the VM required a reboot and thus a restart of the affected process. Also my cluster was unable to elect a MGR and it was pretty much dead until the MONs recovered again. I'm not sure if that is the case with your cluster as well. HTH, Florian
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