How to hot add/remove virtual or real CPUs in RHEL7?

Solution Verified - Updated -

Issue

  • How to hot add/delete vCPU in RHEL7 on the VMware guests?
  • How to check the online/offline vCPUs on RHEL7 in the VMware guests?
  • How to hot add/delete virtual or real cpus, on KVM guests or real hardware?

Environment

  • Red Hat Enterprise Linux 7, all minor versions
  • VMware or KVM as hypervisor, or pure physical hardware (bare metal)

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