Hi, Is there a celing on the number for number of placement groups in a OSD beyond which steady state and/or recovery performance will start to suffer?
Example: I need to create a pool with 750 osds (25 OSD per server, 50 servers). The PG calculator gives me 65536 placement groups with 300 PGs per OSD. Now as the cluster expands, the number of PGs in a OSD has to increase as well. If the cluster size inceases by a factor of 10, the number of PGs per OSD will also need to be increased. What would be the impact of large pg number in a OSD on peering and rebalancing. There is 3GB per OSD available. thanks, Sreenath _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
