I'm starting to get a small Ceph cluster running. I'm to the point where I've created a pool, and stored some test data in it, but I'm having trouble configuring the level of replication that I want.

The goal is to have two OSD host nodes, each with 20 OSDs. The target replication will be:

osd_pool_default_size = 4
osd_pool_default_min_size = 2

That is, I want two copies on each host, allowing for OSD failures or host failures without data loss.

How to best achieve this replication? Is this strictly a CRUSH map rule, or can it be done with the cluster conf? Pointers or examples would be greatly appreciated.

Thanks!

--
Chris
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