Let's say I have a small cluster (3 nodes) with 1 OSD per node. If I create a pool with size 3, such that each object in the pool will be replicated to each OSD/node, is there any reason to create the pool with more than 1 PG? It seems that increasing the number of PGs beyond 1 would not provide any additional benefit in terms of data balancing or durability, and would have a cost in terms of resource usage. But when I try this, I get a "pool <pool> has many more objects per pg than average (too few pgs?)" warning from ceph health. Is there a cost to having a large number of objects per PG?
-Roland
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