Hi, when I designed a ceph cluster nobody talked about radosgw, it was RBD only. Now we are thinking about adding radosgw, and I have some concern when it comes to the number of PG's per OSD (which will grow beyond the 50-100 recommended PG's). According to: http://ceph.com/docs/master/rados/operations/placement-groups/ we learn this: > When using multiple data pools for storing objects, you need to ensure that you balance the number of placement groups per pool with the number of placement groups per OSD so that you arrive at a reasonable total number of placement groups that provides reasonably low variance per OSD without taxing system resources or making the peering process too slow. Good. But when I add radosgw, I need a (surprisingly) high number of additional pools: .rgw .rgw.control .rgw.gc .log .intent-log .usage .users .users.email .users.swift .users.uid I expect that basically only one pool (.rgw?) will hold the true data, all other stuff (like '.users' and so on) will not be data intensive, as it might only store metadata. My question is: When a pool has a lot of PG's but basically almost no data in it, do the OSD's still have a lot of work to do, and does their memory requirement still grow? Or does this only hold true for 'busy' pools? wogri -- http://www.wogri.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |