Instead of installing ntpupdate, you can just tell ntpd that it's okay to shift the clock a lot using the '-g' parameter. See: http://superuser.com/questions/518694/ubuntu-12-10-clock-is-wrong I also find it useful to configure the NTP daemons on my monitors as NTP peers so they exchange time directly with each other as well as reference servers. Matthew On 05/05/2013 09:29 AM, Michael Lowe wrote: > Are you running ntpd? If so you may need to stop, run ntpdate, and > restart ntpd. Sometimes if the clock is too far out of sync ntp won't > update the time. > > On May 5, 2013, at 8:52 AM, Varun Chandramouli <varun.c37@xxxxxxxxx > <mailto:varun.c37@xxxxxxxxx>> wrote: > >> Hi All, >> >> I have a cluster of 4 nodes with 1 mds, 3 mons and 4 osds. Whenever I >> do ceph health or ceph -s, it shows a health warning saying clock skew >> detected in 2 of the 3 mons. When I run a mapreduce application on the >> cluster, one of the monitors crashes (the one in which the skew is not >> detected) soon after the application is started. Sometimes the >> application completes, sometimes, it fails. I would like to know what >> this warning means. Is it responsible for the failing of the >> application. If yes, how to remove the warning? >> >> Here is my ceph.conf: >> >> [global] >> auth client required = none >> auth cluster required = none >> auth service required = none >> >> [osd] >> osd journal data = 1000 >> filestore xattr use omap = true >> >> [mon.a] >> host = lnx147-73 >> mon addr = 10.72.147.73:6789 <http://10.72.147.73:6789> >> >> [mon.b] >> host = lnx148-20 >> mon addr = 10.72.148.20:6789 <http://10.72.148.20:6789> >> >> [mon.c] >> host = lnx-148-27 >> mon addr = 10.72.148.27:6789 <http://10.72.148.27:6789> >> >> [mds.a] >> host = lnx147-73 >> >> [osd.0] >> host = lnx147-73 >> >> [osd.1] >> host = lnx148-20 >> >> [osd.2] >> host = lnx-148-27 >> >> [osd.3] >> host = ln148-28 >> >> I can mail the mon logs and the output of ceph -w for the duration of >> the application. >> >> Regards >> Varun >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Matthew _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |