I believe that if a node in the consensus group exceeds ε clock skew, it will be kicked out of the group.
As far as network partitions go, a consensus must exist for reads or writes. If you don't have 3 out of 5 working correctly and talking to each other, then you are down.
That's correct, it's a consistent system and so the majority needs to be involved on mutating writes. Reads typically can read from one designated copy of the replica directly (bypassing Raft).
As far as network partitions go, a consensus must exist for reads or writes. If you don't have 3 out of 5 working correctly and talking to each other, then you are down.