Hi Stefan, Thanks for volunteering to beta test the crush optimization on a live cluster :-) The "crush optimize" command was published today[1] and you should be able to improve your cluster distribution with the following: ceph report > report.json crush optimize --no-forecast --step 64 --crushmap report.json --pool 3 --out-path optimized.crush ceph osd setcrushmap -i optimized.crush Note that it will only perform a first optimization step (moving around 64 PGs). You will need to repeat this command a dozen time to fully optimize the cluster. I assume that's what you will want to control the workload. If you want a minimal change at each step, you can try --step 1 but it will require more than a hundred steps. If you're not worried about the load of the cluster, you can optimize it in one go with: ceph report > report.json crush optimize --crushmap report.json --pool 3 --out-path optimized.crush ceph osd setcrushmap -i optimized.crush Cheers [1] http://crush.readthedocs.io/en/latest/ceph/optimize.html -- Loïc Dachary, Artisan Logiciel Libre -- 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
