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Note the following constraints for distributed systems.

TREX Instances

The TREX instances that form a distributed system must run on different hosts. You cannot combine several TREX instances on the same host to form a distributed system.

Hosts

  • SAP recommends using a maximum of 4 master hosts.
  • SAP recommends using a maximum of 2 slave hosts per master host

For information on equipping the hosts, seeHardware, Software, and Other Requirements

Master name servers

You need at least two master name servers, and cannot define more than three. Keep to the following rules:

  • First distribute the master name servers on the master hosts.
  • If there is a backup host, distribute the other master name servers there.
  • If there is no backup host, distribute the other master name servers on the slave hosts.

Indexes

  • You can have a maximum of 50 master indexes per master index server.
  • If the master index server has 2 GB working memory per CPU, the maximum size of a master index is 100 GB.