Many OSDs on one node and replica distribution

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Hi dear list,

i have a question about distribution of replicas on hosts with multiple
OSDs.

For example this configuration:
4x nodes
each node has 4 OSDs
replica set to 3

When i save now an object to the pool, how it is replicated? Is there a
chance that the original object and the 2 replicas are stored on the
same node? 

I cant believe that but it was never clear for me. If yes and the node
fails this means the object is destroyed. Or should i set the replica
count to 5 to be sure?

Thanks.

-- 
Mit freundlichen Grüßen / Best regards
Rene Hadler


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