3.5.1 Using a resource server to share shared resources
Normally, you must provide shared resources for each server. If you use a resource server, shared resources can be shared among multiple servers. You use a resource server when the available shared resources are limited.
- Organization of this subsection
(1) Configuration using a resource server
A resource server controls shared resources. No program runs in a resource server. You always group a resource server with other servers. When you use a resource server, you can control shared resources for a server group.
The figure below shows a configuration that includes a resource server. In this example, servers 1 and 2 share the same shared disk and alias IP address.
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![[Figure]](GRAPHICS/F0000082.GIF)
If servers are grouped together to perform grouped-system switchover but no resource server is used, the shared resources are controlled for each server. Therefore, the same shared resources cannot be shared among multiple servers.
(2) Required environment settings
The following environment settings are required in order to use a resource server:
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Use the resource definition statement in the server environment definition to specify the resource server settings.
Environment settings for a resource server are required because the resource server is added to the host.
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Use the group operand in the server environment definition to specify the settings for grouping servers.
This specification is required for all servers that are to run in the same group.
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Use the parent operand in the server environment definition to specify the settings for server order control.
Specify the resource server as the parent server for all servers that are not the resource server and that are to run in the same group.