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.
Example 1
The following system has two master servers that are sharing a backup server.
In this case, select Use One Shared Backup Server.
Example 2
In the following system, each master server has its own backup server.
In this case, do not select Use One Shared Backup Server.