On 03/14/2014 12:37 PM, Brian Andrus wrote: > To add on to Mark's thoughtful reply - The formula was intended to be > used on a *per-pool* basis for clusters that have a small number of > pools. However in small or large clusters, you may consider scaling up > or down per Mark's suggestion, or using a fixed amount per pool to keep > the numbers (and resource consumption) from growing out of hand with the > addition of numerous pools. > > As Mark mentioned - a small cluster can safely get "some extra", > especially if you plan on growing the cluster. Increasing the number of > PGs can be an intensive operation, so planning for the future can be > beneficial. As you might see there are many factors to keep in mind when > selecting an optimal number. It seems that a lot of these calculation-type questions can be resolved by knowing *roughly* what (OSD and MON) resources are required for a single specifically-sized PG (in idle and in recovery modes). peter _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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