So is it recommended to adjust the rebalance timeout to align with the time to reboot individual nodes? I didn't see this in my pass through the ops manual but maybe I'm not looking in the right place. Thanks, ~jpr > On Dec 19, 2013, at 6:51 PM, "Sage Weil" <sage@xxxxxxxxxxx> wrote: > >> On Thu, 19 Dec 2013, John-Paul Robinson wrote: >> What impact does rebooting nodes in a ceph cluster have on the health of >> the ceph cluster? Can it trigger rebalancing activities that then have >> to be undone once the node comes back up? >> >> I have a 4 node ceph cluster each node has 11 osds. There is a single >> pool with redundant storage. >> >> If it takes 15 minutes for one of my servers to reboot is there a risk >> that some sort of needless automatic processing will begin? > > By default, we start rebalancing data after 5 minutes. You can adjust > this (to, say, 15 minutes) with > > mon osd down out interval = 900 > > in ceph.conf. > > sage > >> >> I'm assuming that the ceph cluster can go into a "not ok" state but that >> in this particular configuration all the data is protected against the >> single node failure and there is no place for the data to migrate too so >> nothing "bad" will happen. >> >> Thanks for any feedback. >> >> ~jpr >> _______________________________________________ >> ceph-users mailing list >> 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
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