Virsh setvcpus

https://libvirt.org/sources/virshcmdref/html-single/#sect-setvcpus

• virsh setvcpus VM_NAME 5 --live
• virsh setvcpus VM_NAME 5 --config --maximum
• virsh setvcpus VM_NAME 5 --config
• virsh setvcpus VM_NAME 5 --config --live

• virsh setvcpus --count 10 VM_NAME

Check:

• virsh dominfo VM_NAME | grep CPU
• virsh vcpucount

• Hot unplugging vCPUs is not supported on Red Hat Enterprise Linux 7

virsh setvcpus VM_NAME 2 --live
error: invalid argument: requested vcpus is greater than max allowable vcpus for the live domain: 16 > 4

virsh setvcpus VM_NAME 2 --live
error: Requested operation is not valid: domain is not running

virsh setvcpus --count 10 VM_NAME
error: Requested operation is not valid: domain is not running

virsh setvcpus VM_NAME 2 --config --maximum
(no answer on success)

virsh setvcpus VM_NAME 2 --config
(no answer on success)

Related commands

• virsh maxvcpus https://libvirt.org/sources/virshcmdref/html-single/#sect-maxvcpus
• virsh setmem
• virsh edit
• virsh vcpuinfo
• virsh vcpucount
• virsh dumpxml: <vcpu placement='static'>4</vcpu>
• virt-xml
• virsh domstats

Related terms

 <vcpu placement='static'>4</vcpu>

 /var/log/libvirt/qemu/VM_MACHINE_NAME.log
.../... -smp 2,sockets=2,cores=1,threads=1 .../...

• Multipass: Modify number of CPU on an existing instance

See also

• Virsh CPU Commands
• Virsh CPU Commands: virsh vcpuinfo, virsh setvcpus, virsh vcpucount
• virsh: Storage information, Connecting, Operations, Memory, Snapshots, Networking, CPU, release notes, virsh nodedev-list

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/virtualization_deployment_and_administration_guide/index