As described recently in several other threads, we like to add OSDs in to their proper CRUSH location, but with the following parameter set: osd crush initial weight = 0 We then bring the OSDs in to the cluster (0 impact in our environment), and then gradually increase CRUSH weight to bring them to their final desired value, all at the same time. The script I use basically checks for all OSDs less than our target weight in each iteration, and moves it closer to the target weight by a defined increment and then waiting for HEALTH_OK or other acceptable state. I would suggest starting with .001 with large groups of OSDs. We can comfortably bring in 100 OSDs with increments of .004 at a time or so.. Theoretically we could just let them all weight in at once, but this allows us to find a comfortable rate and pause the process whenever/wherever we want if it does cause issues. Hope that helps. On Fri, Feb 17, 2017 at 1:42 AM, nigel davies <nigdav007 at gmail.com> wrote: > Hay All > > How is the best way to added multiple osd's to an active cluster? > > As the last time i done this i all most killed the VM's we had running on > the cluster > > Thanks > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -- Brian Andrus | Cloud Systems Engineer | DreamHost brian.andrus at DreamHost.com | www.dreamhost.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20170217/4a5e776e/attachment.htm>
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