Set Enforce Unique Host

Configure vFabric GemFire to use only unique physical machines for redundant copies of partitioned region data.

Understand how to set a member's gemfire.properties settings. See gemfire.properties and gfsecurity.properties (vFabric GemFire Property Files).
Configure your members so GemFire always uses different physical machines for redundant copies of partitioned region data using the gemfire.properties setting enforce-unique-host. The default for this setting is false.
Example:
enforce-unique-host=true