Adding CPUs to a VM
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Article Number : KB0011596
Published on : 2020-03-09
Last modified : 2020-03-09 13:28:19
Knowledge Base : IT Public Self Help
Adding CPUs to a Virtual Machine in UT-VMG -- requires VM shutdown/power-on
Changing the number of virtual CPUs in a VM IMMEDIATELY (when you select OK)
- In the Items -> Machines page select the VM in question and in the Actions menu, select Reconfigure
- Enter the new # CPUs: for this VM
- ITS provided blueprints/templates should support hot adding CPUs. If you would like to add CPUs without a reboot, choose the Execution tab and select Do not reboot for the Power Action.
NOTE: reducing CPUs always requires Reboot.
- The change will occur immediately after clicking Submit if the CPU count is below the approval threshold. If the requested number of CPUs are greater than or equal to the approval level, the change will occur as soon as it is approved. (By default, approvers are the UT-VMG administrators but if you are using custom blueprints, there may be approvers in your department.)
- Select Submit.
- If you chose to reboot, the VM will be shutdown, the VM CPUs will be reconfigured, and the VM will be powered back on. If you've selected Do not reboot for the Power Action, the CPUs will be reconfigured while the VM runs.
Scheduling a change in number of CPUs for a VM
- To have this occur sometime in the FUTURE, e.g. during a maintenance window - use steps above for immediate change, but INSTEAD of selecting the Submit button, select the Execution tab...
- Change "Execute request:" to Scheduled, then Enter the appropriate date/time for the Shutdown/Reconfiguration/Power-on to occur.
- Power action: should be set to Reboot unless you want to attempt hot adding CPUs. If you are adding CPUs and the VM supports it, you can choose Do not reboot. Reducing CPUs always requires a shutdown or power off.
- You may also enter an optional reason
- Select the Submit button.
- If you now go back to your VM list you will see that you've got a scheduled reconfiguration:
- At the scheduled time, the VM will be shutdown via the Guest OS Shutdown, reconfigured, then powered back on. If you chose not to shut down, the CPUs will be increased while the VM is running.
Note: if the number of CPUs is greater than the approval level, the request must be approved by the scheduled time. (By default, approvers are the UT-VMG administrators but if you are using custom blueprints, there may be approvers in your department.)
- To see the logs you can look at the Requests tab.
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