In a 12 OSD setup, the following config is there:
(OSDs * 100)
Total PGs = ----------
pool size
So with 12 OSD's and a pool size of 2 replicas, this would equal Total
PGs of 600 as per this url:
http://docs.ceph.com/docs/master/rados/operations/placement-groups/#preselection
Yet in the same page, at the top it says:
Between 10 and 50 OSDs set pg_num to 4096
Our use is for shared hosting so there are lots of small writes and
reads. Which of these would be correct?
Also is it a simple process to update PGs on a live system without
affecting service?
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