5.5. Hot Plugging vCPUs
You can hot plug vCPUs. Hot plugging means enabling or disabling devices while a virtual machine is running.
Hot unplugging a vCPU is only supported if the vCPU was previously hot plugged. A virtual machine’s vCPUs cannot be hot unplugged to less vCPUs than it was originally created with.
The following prerequisites apply:
- The virtual machine’s Operating System must be explicitly set in the New Virtual Machine or Edit Virtual Machine window.
- The virtual machine’s operating system must support CPU hot plug. See the table below for support details.
- Windows virtual machines must have the guest agents installed. See Section 3.3.2, “Installing the Guest Agents and Drivers on Windows”.
Hot Plugging vCPUs
- Click → and select a running virtual machine.
- Click .
- Click the System tab.
- Change the value of Virtual Sockets as required.
- Click .
Table 5.1. Operating System Support Matrix for vCPU Hot Plug
| Operating System | Version | Architecture | Hot Plug Supported | Hot Unplug Supported |
|---|---|---|---|---|
| Red Hat Enterprise Linux Atomic Host 7 | x86 | Yes | Yes | |
| Red Hat Enterprise Linux 6.3+ | x86 | Yes | Yes | |
| Red Hat Enterprise Linux 7.0+ | x86 | Yes | Yes | |
| Red Hat Enterprise Linux 7.3+ | PPC64 | Yes | Yes | |
| Microsoft Windows Server 2008 | All | x86 | No | No |
| Microsoft Windows Server 2008 | Standard, Enterprise | x64 | No | No |
| Microsoft Windows Server 2008 | Datacenter | x64 | Yes | No |
| Microsoft Windows Server 2008 R2 | All | x86 | No | No |
| Microsoft Windows Server 2008 R2 | Standard, Enterprise | x64 | No | No |
| Microsoft Windows Server 2008 R2 | Datacenter | x64 | Yes | No |
| Microsoft Windows Server 2012 | All | x64 | Yes | No |
| Microsoft Windows Server 2012 R2 | All | x64 | Yes | No |
| Microsoft Windows Server 2016 | Standard, Datacenter | x64 | Yes | No |
| Microsoft Windows 7 | All | x86 | No | No |
| Microsoft Windows 7 | Starter, Home, Home Premium, Professional | x64 | No | No |
| Microsoft Windows 7 | Enterprise, Ultimate | x64 | Yes | No |
| Microsoft Windows 8.x | All | x86 | Yes | No |
| Microsoft Windows 8.x | All | x64 | Yes | No |
| Microsoft Windows 10 | All | x86 | Yes | No |
| Microsoft Windows 10 | All | x64 | Yes | No |
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