Hi Ceph: Recently I encountered some a "clock skew" issue with 0.94.3. I have some small demo clusters in AWS. When I boot them up, in most cases the cluster will start in HEALTH_WARN due to clock skew on some of the MONs. I surmise that this is due to a race condition between the ceph-mon and ntpd systemd services. Sometimes ntpd.service starts *after* ceph-mon - in this case the MON sees a wrong/unsynchronized time value. Now, even though ntpd.service starts (and fixes the time value) very soon afterwards, the cluster remains in clock skew for a long time - but that is a separate issue. What I would like to ask is this: Is there any reasonable Ceph cluster node configuration that does not include running the NTP daemon? If the answer is "no", would it make sense to make NTP a runtime dependency and tell the ceph-mon systemd service to wait for ntpd.service before it starts? Thanks and regards -- Nathan Cutler Software Engineer Distributed Storage SUSE LINUX, s.r.o. Tel.: +420 284 084 037 -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
