Tarantella Administration Guide > Arrays, servers and load balancing > Load Balancing properties (array-wide)

Load Balancing properties (array-wide)

Attributes on the Load Balancing Properties panel of Array Manager are used:

The attributes apply to all array members.

From the command line, use tarantella config to view and edit these settings.

Changes to these attributes take effect immediately.

Array ManagerCommand lineDescription
Emulator Sessions:
Use array member with		--sessions-loadbalancing-algorithm algorithm
  • The algorithm used at application launch time to choose the array member that hosts the emulator session (in other words, the method used to choose where to run the Protocol Engine when a user starts an application).
  • In Array Manager, values are User's webtop session, Least CPU usage and Fewest emulator sessions.
  • On the command line, values are:
    .../_beans/com.sco.tta.server.loadbalancing.tier2.LocalLoadBalancingPolicy
    (for User's webtop session)
    .../_beans/com.sco.tta.server.loadbalancing.tier2.CpuLoadBalancingPolicy
    (for Least CPU usage)
    .../_beans/com.sco.tta.server.loadbalancing.tier2.SessionLoadBalancingPolicy
    (for Fewest emulator sessions).
  • Select User's webtop session to choose the array member which is hosting the user's webtop session.
Applications:
Use application server with		--launch-loadbalancing-algorithm cpu | memory | sessions
  • The default algorithm Tarantella uses to choose the best application server on which to run the application. The server is selected from those defined on the application object's Hosts tab.
  • This attribute is only used if the value of the application object's Load Balancing Algorithm is Use array-wide setting.
  • Select one of the following settings:
    • Least CPU usage (cpu) - choose the application server with the most CPU idle time.
    • Most free memory (memory) - choose the application server with the most free memory.
    • Fewest application sessions (sessions) - choose the application server that is running the fewest application sessions through Tarantella. This is the default setting.
  • The Least CPU usage and Most free memory algorithms are only available if you have installed an Advanced Load Management license key.

    Note To use these algorithms, you must also install the Tarantella Enhancement Module on the application server.

Related topics
  • Introducing webtop and emulator session load balancing
  • Understanding webtop and emulator sessions
  • Introducing application server load balancing
  • Setting up a Tarantella Enhancement Module