Hi, perhaps an stupid question, but why you change the hostname? Not tried, but I guess if you boot the node with an new hostname, the old hostname are in the crush map, but without any OSDs - because they are on the new host. Don't know ( I guess not) if the degration level stay also on 5% if you delete the empty host from the crush map.
I would simply use the same hostconfig on an rebuildet host. Udo On 03.12.2014 05:06, Indra Pramana wrote: > Dear all, > > We have a Ceph cluster with several nodes, each node contains 4-6 > OSDs. We are running the OS off USB drive to maximise the use of the > drive bays for the OSDs and so far everything is running fine. > > Occasionally, the OS running on the USB drive would fail, and we would > normally replace the drive with a pre-configured similar OS and Ceph > running, so when the new OS boots up, it will automatically detect all > the OSDs and start them. It works fine without any issues. > > However, the issue is in recovery. When one node goes down, all the > OSDs would be down and recovery will start to move the pg replicas on > the affected OSDs to other available OSDs, and cause the Ceph to be > degraded, say 5%, which is expected. However, when we boot up the > failed node with a new OS, and bring back the OSDs up, more PGs are > being scheduled for backfilling and instead of reducing, the > degradation level will shoot up again to, for example, 10%, and in > some occasion, it goes up to 19%. > > We had experience when one node is down, it will degraded to 5% and > recovery will start, but when we manage to bring back up the node > (still the same OS), the degradation level will reduce to below 1% and > eventually recovery will be completed faster. > > Why the same behaviour doesn't apply on the above situation? The OSD > numbers are the same when the node boots up, the crush map weight > values are also the same. Only the hostname is different. > > Any advice / suggestions? > > Looking forward to your reply, thank you. > > Cheers. > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
