After you have added hosts to the distributed system, you define which roles the hosts are to have. There are the following roles:
There can be up to three master name servers in a distributed system. At least two must be defined. SeeConstraints for information on the hosts on which the master name servers must be located.
Defining a Master Name Server
Defining a Master Index Server or Master Queue Server
Defining a Slave Index Server
Defining a Backup Index Server or Backup Queue Server
The graphics below only depict the master and backup index servers. The graphics are also valid for master and backup queue servers.
The following system has two master servers that are sharing a backup server.
In this case, select Use One Shared Backup Server.
In the following system, each master server has its own backup server.
In this case, do not select Use One Shared Backup Server.