4.3.1 Reducing the system scale by decreasing number of hosts (scale in)
In scale in operations, you can decrease the number of hosts that are not required and can cut down the operational cost incurred on maintenance by decreasing the number of hosts, thereby reducing the system scale.
In the Smart Composer functionality, you can decrease the number of the hosts or the logical servers in a batch for each service unit. Also, in the management portal, you can decrease the number of the hosts and the logical servers separately by using the respective windows of the Management Portal window.
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Example of system operations
The following figure shows an example of the system operations for reducing the scale, by decreasing the number of hosts. The system used in this example is set up in 4.2 System operations to expand the system scale by increasing the number of hosts (scale out).
Figure 4‒7: Example of the system operations for reducing the scale by decreasing the number of hosts ![[Figure]](GRAPHICS/ZU001000.GIF)
The following table describes the settings used in the example:
Table 4‒22: Settings used in the example (system scale in) Classification
Item
Example of settings
Entire system
Name of Web system
MyWebSystem
Name of the service unit to be deleted
unit2
Host for allocating the Web server to be deleted
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 deleted
Host name
apsv4
IP address (management IP address)#
192.168.100.14
Name of the logical J2EE server
MyWebSystem_J2EE02
Name of the logical performance tracer
MyWebSystem_PRF04
# If the network consists of one configuration, the IP address serves as both the business IP address and the management IP address.
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Tasks to be executed and necessity of the tasks
The following table describes the tasks to be executed for the system scale in operation and the necessity of these tasks. Use the Smart Composer functionality to implement the system scale in.
Table 4‒23: Tasks to be executed for the system scale in and the necessity of these tasks (when using the Smart Composer functionality) Tasks to be implemented for the system scale in
Necessity of the tasks
Conditions for executing the tasks
References
Stopping the service unit
Y
Mandatory
Deleting the service unit and unsetup of logical server environment
Y
Mandatory
- Legend:
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Y: Mandatory task.