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In the dialog area Connected servers special information for each server is displayed in the columns Type and Role .
The following gives a detailed explanation:
The Type is defined in the license file:
The Role MASTER/BACKUP tells you which sever currently is the authoritative server.
(There is always one server with the role of MASTER.)
If the master fails, the backup server takes over, however, it can only run for a restricted time frame.
As soon as the master is back, it immediately receives the role "backup" again.
The server running for the longest time will become the master, as long as 2 other nodes in the cluster are online (The cluster has Quorum).
There is no restriction of backup time (because there is no server with the specification "always master" in a 3 node cluster).