On the VMware platform only, before beginning the upgrade, disable the CPU reservation check inside the guest by renaming the file: vmware-toolbox-cmd. For example, issue the following command: mv /usr/bin/vmware-toolbox-cmd /usr/bin/vmware-toolbox-cmd.bak
Stop standby SBC by issuing "sbxstop". Wait until the SBC processes stop.
Shutdown the standby SBC by issuing "power off" command.
Increase vCPU count on the powered off standby SBC.
Stop active SBC by issuing "sbxstop". Wait until the SBC processes stop. Note that this is service affecting since both SBCs are stopped now.
Shutdown the active SBC by issuing "power off" command.
Increase vCPU count on the powered off active SBC.
Power on an active SBC. Wait for the SBC to fully start as active.
Power on a standby SBC. The SBCs should start as standby and get in sync with active SBC.
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Note
For any other CPU upgrade combination, use the procedure below: