This change slowed things down (slightly) for me, although the change is within the margin of error so it probably made no difference.
Before: $ time ./run virt-v2v -i disk /var/tmp/fedora-35.qcow2 -o rhv-upload -oc https://ovirt4410/ovirt-engine/api -op /tmp/ovirt-passwd -oo rhv-direct -os ovirt-data -on test14 -of raw [ 0.0] Setting up the source: -i disk /var/tmp/fedora-35.qcow2 [ 1.0] Opening the source [ 6.5] Inspecting the source [ 10.5] Checking for sufficient free disk space in the guest [ 10.5] Converting Fedora Linux 35 (Thirty Five) to run on KVM virt-v2v: warning: /files/boot/grub2/device.map/hd0 references unknown device "vda". You may have to fix this entry manually after conversion. virt-v2v: This guest has virtio drivers installed. [ 57.0] Mapping filesystem data to avoid copying unused and blank areas [ 59.0] Closing the overlay [ 59.6] Assigning disks to buses [ 59.6] Checking if the guest needs BIOS or UEFI to boot [ 59.6] Setting up the destination: -o rhv-upload -oc https://ovirt4410/ovirt-engine/api -os ovirt-data [ 79.3] Copying disk 1/1 █ 100% [****************************************] [ 89.9] Creating output metadata [ 94.0] Finishing off real 1m34.213s user 0m6.585s sys 0m11.880s After: $ time ./run virt-v2v -i disk /var/tmp/fedora-35.qcow2 -o rhv-upload -oc https://ovirt4410/ovirt-engine/api -op /tmp/ovirt-passwd -oo rhv-direct -os ovirt-data -on test15 -of raw [ 0.0] Setting up the source: -i disk /var/tmp/fedora-35.qcow2 [ 1.0] Opening the source [ 7.4] Inspecting the source [ 11.7] Checking for sufficient free disk space in the guest [ 11.7] Converting Fedora Linux 35 (Thirty Five) to run on KVM virt-v2v: warning: /files/boot/grub2/device.map/hd0 references unknown device "vda". You may have to fix this entry manually after conversion. virt-v2v: This guest has virtio drivers installed. [ 59.6] Mapping filesystem data to avoid copying unused and blank areas [ 61.5] Closing the overlay [ 62.2] Assigning disks to buses [ 62.2] Checking if the guest needs BIOS or UEFI to boot [ 62.2] Setting up the destination: -o rhv-upload -oc https://ovirt4410/ovirt-engine/api -os ovirt-data [ 81.6] Copying disk 1/1 █ 100% [****************************************] [ 91.3] Creating output metadata [ 96.0] Finishing off real 1m36.275s user 0m4.700s sys 0m14.070s Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/ _______________________________________________ Libguestfs mailing list Libguestfs@redhat.com https://listman.redhat.com/mailman/listinfo/libguestfs
