What will happened if RBD lose all copied of data-block and I read the block?

Context:
I want use RDB as main storage with replication factor 1 and drbd for 
replication on non rbd storage by client side.

For example:
Computer1:
1. connect rbd as /dev/rbd15
2. use rbd as disk for drbd

Computer2:
Use HDD for drbd-replication.


I want protect from break of ceph system (for example while upgrade ceph) and 
long-distance replication.


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