Hello, Problem1: Ceph health says HEALTH_WARN clock skew detected on mon.b, mon.c But: root@hcmonko1:~# date && ssh hcmonko3 date && ssh hcmonko2 date Thu May 23 18:19:38 CEST 2013 Thu May 23 18:19:38 CEST 2013 Thu May 23 18:19:38 CEST 2013 Seems to be ok, ntp configured. Restarted all the servers, still the same. Problem 2: Service ceph -a works seriell, not parallel. Situation: every osd and mon is offline via service ceph -a stop. When I want to bring them online with "service ceph -a start", it begins with mon a, then mon b, then osd0, osd1 etc. But the procedure hangs at the point ceph-create keys for the first mon in the row. root@hcosdko1:~# service ceph -a start === mon.a === Starting Ceph mon.a on hcmonko1... Starting ceph-create-keys on hcmonko1... I get to know via your irc-channel that ceph-create-keys needs the mon quorum to proceed. I think the ceph -a start script is designed to not make it serial, rather it has to do it parallel for all mons+osd. But in my scenario it hangs at this point: ceph is started on mon1, hangs at the keys because there is no quorum => ceph will not start on mon2,mon3, osd0 and so on. (when I type "service ceph -a start on mon1, it will begin on the host itself, create the keys, proceed with starting ceph on mon2 and can create the keys there, because there is a quorum because ceph is started already on mon1). Question1 For testing we have only 1 osd node at this moment, there will follow 2 other nodes, perhaps we will add certain osd hdds in one server/node. when i want to add a node or only an osd.. is it right, that i change the ceph.conf, copy it via ssh to each node(mon,osd,..) and then make ceph -a start to reload the new config, so the new servers,osds,mons etc are activated? When I wants to add an osd (hdd), I have to type makecephfs --mkfs.. will it destroy the data on the already existing osd-hdds? Question2 when i have to restart 1 server, i think the ceph mechanism will start replicating the data to the other hosts directly. is it possible to define a server/osd for maintenance mode, so rados does not begin to start replicating the data, only because 1 osd is restarting? Thank you very much! Regards Philipp -- 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
