Virsh blockcommit

virsh blockcommit domain path [bandwidth] [--bytes] [base] [--shallow] [top] [--delete] [--keep-relative] [--wait [--async] [--verbose]] [--timeout seconds] [--active] [{--pivot | --keep-overlay}]

Requires at least QEMU 2.1 and libvirt-1.2.9.

Review your security_driver configuration in /ect/libvirt/qemu.conf. You may need to change it to none to allow virsh blockcommit

security_driver = "none"

Options:

--active to trigger a two-phase active commit

--pivot making base the new active image and invalidating top

--wait

--verbose

Examples

virsh blockcommit MY_DOMAIN_NAME vda --active --pivot
Successfully pivoted

virsh blockcommit MY_DOMAIN_NAME vda --active --pivot
Commit aborted

virsh blockcommit MY_DOMAIN_NAME vda --active --pivot --wait --verbose
Block commit: [ 22 %]
Successfully pivoted

virsh blockcommit MY_DOMAIN_NAME hda --active --pivot
error: invalid argument: top '/path/to/libvirt/MY_DOMAIN_NAME.qcow2' in chain for 'hda' has no backing file

Use: virsh domblklist --details to find your block name.

Journalctl errors

libvirtd[14189]: 2019-11-21 15:08:13.035+0000: 14192: error : qemuDomainBlockCommit:17568 : invalid argument: top '/path/to/file/VM_NAME.qcow2' in chain for 'hda' has no backing file

Activities

• Create a KVM Live backup using virsh snapshot-create-as and virsh blockcommit

See also

• virsh blockjob
• virsh domblklist
• virsh console

https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit

https://github.com/milkey-mouse/backup-vm/issues/17#issuecomment-547843000