The formula was designed to be used on a per-pool basis. Having said that, though, when looking at the number of PG's from a system-wide perspective, one does not want too many total PG's. So, it's a balancing act, and it has been suggested that it's better to have slightly more PG's than you need, but not too many. From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Pieter Koorts Sent: Monday, May 12, 2014 5:21 AM To: ceph-users at ceph.com Subject: CEPH placement groups and pool sizes Hi, Been doing some reading on the CEPH documentation and just wanted to clarify if anyone knows the (approximate) correct PG's for CEPH. What I mean is lets say I have created one pool with 4096 placement groups. Now instead of one pool I want two so if I were to create 2 pools instead would it be still 4096 placement groups per pool or would I divide it between the pools (e.g. 2048 pg per pool) On a side note, per pool is that a recommended maximum of data before turning over to a new pool? Regards Pieter -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140512/74e3424c/attachment.htm>
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