> Doesn't the existing mgr balancer already balance the PGs for each pool > individually? So in your example, the PGs from the loaded pool will be > balanced across all osds, as will the idle pool's PGs. So the net load is > uniform, right?
If there’s a single CRUSH root and all pools share the same set of OSDs? I suspect that what he’s getting at is if pools use different sets of OSDs, or (eek) live on partly overlapping sets of OSDs. > OTOH I could see a workload/capacity imbalance if there are mixed capacity > but equal performance devices (e.g. a cluster with 50% 6TB HDDs and 50% 12TB > HDDs). > In that case we're probably better to treat the disks as uniform in size > until the smaller osds fill up. Primary affinity can help, with reads at least, but it’s a bit fussy. _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
