4.2.1 Expanding the system scale by increasing hosts (scale out)

In the scale out operation, the processing performance of the entire system can be improved by increasing the number of hosts, thereby expanding the system scale.

In the Smart Composer functionality, you can increase the hosts and logical servers in batch for each service unit. In the management portal, you can also increase the hosts and the logical servers separately by using respective windows of the Management Portal window.

• Example of system operations

  The following figure shows an example of the system operations of expanding the scale by increasing the number of hosts. The system used in this example is set up in 4.1 System setup for improving machine performance by allocating Web Server to a different host.

  Figure 4‒6: Example of the system operations of the expanding the scale by increasing the number of hosts

  The following table describes the settings used in the example:

  Table 4‒19: Settings used in the example (System scale out)

  Classification	Item	Example of settings
  Entire system	Name of the configuration change definition file	MyWebSystemAdd.xml
  	Name of the Web system	MyWebSystem
  	Name of the service unit to be added	unit2
  Host for allocating the Web server to be added	Host name	apsv3
  	IP address (management IP address)#	192.168.100.13
  	Name of the logical Web server	MyWebSystem_HTTP02
  	Name of the logical performance tracer	MyWebSystem_PRF03
  Host for allocating the J2EE server to be added	Host name	apsv4
  	IP address (management IP address)#	192.168.100.14
  	Name of logical J2EE server	MyWebSystem_J2EE02
  	Name of logical performance tracer	MyWebSystem_PRF04
  	Name of resource adapter file	DBConnector_HiRDB_Type4_CP.rar
  	Display name of resource adapter	DB_Connector_for_HiRDB_Type4
  	Name of the Connector property file	MyDBConnectorAttr.xml
  	File name of J2EE application	MyApp.ear
  	Display name of J2EE application	MyApp

  # If the network consists of one configuration, the IP address serves as both the business IP address and the management IP address.

• Tasks to be executed and necessity of the tasks

  The following table describes the tasks to be executed during system scale out and the necessity of these tasks. Use the Smart composer functionality to implement the system scale out.

  Table 4‒20: Tasks to be executed during system scale out and the necessity of the tasks (when using the Smart Composer functionality)

  Tasks to be implemented when the system is to be scaled out	Necessity of the task	Conditions for executing the task	References
  Setting up the system	Y	Mandatory	4.1
  Preparing the host to be added	Y	Mandatory	4.2.2(1)
  Creating the configuration change definition file	Y	Mandatory	4.2.2(2)
  Changing the system information model	Y	Mandatory	4.2.2(3)
  Adding the service unit	Y	Mandatory	4.2.2(4)

  Legend:

  Y: Mandatory task

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