device: 0.847
other: 0.846
semantic: 0.662
vnc: 0.557
network: 0.547
graphic: 0.539
files: 0.527
PID: 0.511
boot: 0.402
performance: 0.318
socket: 0.304
debug: 0.146
permissions: 0.083
KVM: 0.003

qemu drive-mirror live migration sparse copy
Additional information:
Please reference this Proxmox post where the developers mention this feature not being available:
https://forum.proxmox.com/threads/migration-on-lvm-thin.50429/