This section explains the overcommit function for L-Servers.
Overcommit
The RHEL-KVM overcommit function for the CPU and memory is available on Resource Orchestrator.
The RHEL-KVM overcommit function for the CPU and memory virtually allows a guest OS to use more resources than that of the actual CPU and memory of a server.
Resource Orchestrator provides the following functions to utilize the RHEL-KVM overcommit function when creating L-Servers.
Setting an overcommit attribute for a resource pool
Overcommit attributes can be set for resource pools. If an L-Server template with the overcommit attribute configured is used, an L-Server with the overcommit attribute configured can be created by selecting the resource from the resource pool with overcommit configured.
Deployment of L-Servers with more resources than those of the server
Creation of an L-Server with more resources than that of the actual CPU or memory installed on a server is possible.
Whether the resulting L-Server can be started depends on the resources available on the VM host.
Installation Procedure
Create a VM Pool for Overcommit
For details on how to create a VM pool, refer to "Chapter 20 Resource Pool Operations" in the "User's Guide for Infrastructure Administrators (Resource Management) CE".
Point
Refer to the "Point" described in "1. Create a VM Pool for Overcommit" in "Installation Procedure" in "8.2.11 Overcommit".
Note
Refer to the "Note" described in "1. Create a VM Pool for Overcommit" in "Installation Procedure" in "8.2.11 Overcommit".
Create a VM Specific Information Definition File
Create a VM specific information definition file. Create a VM specific information definition file when configuring different settings for individual user groups without configuring overcommit settings on the L-Server template.
For VM specific information definition files, refer to "8.1 Definition Files Commonly Shared when Creating Virtual L-Servers".
For details on how to edit the L-Server template, or create and check an L-Server, perform the operations of step 3 and later described in "8.2.11 Overcommit". Since the values that can be configured in the L-Server template or the VM specific information definition files as described in the reference differ depending on the VM types, replace the values with ones for KVM.
Note
Due to limitations of the KVM management application, it may take a few minutes until the amount of memory used by VM is reflected on the ROR console.
