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Berkeley DB Reference Guide:
  Berkeley DB Replication

# Replication environment priorities

Each database environment included in a replication group must have a priority, which specifies a relative ordering among the different environments in a replication group. This ordering determines which environment will be selected as a new master in case the existing master fails.

Priorities must be a non-negative integer, but do not need to be unique throughout the replication group. A priority of 0 means the system can never become a master, regardless. Otherwise, larger valued priorities indicate a more desirable master. For example, if a replication group consists of three database environments, two of which are connected by an OC3 and the third of which is connected by a T1, the third database environment should be assigned a priority value which is lower than either of the other two.

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