Types

There are three types of replica:

• Master replica. A writable replica that contains all object information for the partition. All partition operations (create, join, delete, and repair) occur from the master replica of a given partition.

  Only one master replica can be defined for each partition.

• Read/write replica. Contains the same object information as the master replica. Allows modifications (writes) to a partition, which are passed to other replicas of the partition.

  There can be any number of read/write replicas.

• Read-only replica. Contains the same object information as the master replica, but the information can only be read. Used where reading of the partition is required but writes to the partition should not occur.

  Note that log in requires a writable replica. Also, bindery services requires a writable replica. When bindery services is set, use either a master or read/write replica.

  See ``NDS Bindery Services'' for more information.