Typical architecture in RDB mode - Number of servers explained ?

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Dear Ceph users,

We are currently working on CEPH (RBD mode only). The technology is currently in "preview" state in our lab. We are currently diving into Ceph design... We know it requires at least 3 nodes (OSDs+Monitors inside) to work properly. But we would like to know if it makes sense to use 4 nodes ? I've heard this is not a good idea because all of the capacity of the 4 servers won't be available ?
Someone can confirm ?

Thank you for advance,

Best regards
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