Juniper JUNOS SPACE 2.0 - RELEASE NOTES, Руководство по установке

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Add second node: When a second node is added to the fabric, the first node functions
as the active load balancer server and active database server, and the second node
functions as the standby load balancer server and standby database server. The load
balancer and application logic node functions provide scalability and high availability.
The database node function on the second node provides high availability only. The
following illustration shows the functions enabled on a fabric comprising two nodes.
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Add third node: Only the application logic functionality is enabled on the third node to
provide equal distribution of device connections and user requests across all nodes,
and route device-related operations to the node to which the device is connected. The
application logic functionality provides both scalability and high availability. The
following illustration shows the functions enabled on a fabric comprising three nodes.
NOTE: For the third node and each subsequent node added to the fabric,
only the application logic functionality is enabled.
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Junos Space Virtual Appliance Installation Guide