Prevent virsh live migration from copy zero -- increment copy on live migration possible ?

Hi, i am doing a live migration like this: [root@nodeA ~]#virsh migrate --copy-storage-all --verbose --live kvm1776 qemu+ssh://nodeb/system which works fine with libvirt version 6. The zfs backed hdd is 100G, while its thin-provisioned. The real data on it is 1G. So even its 1G of data, virsh copies a lot of zero's as it seems. There is a lot of HDD IO and network activity, but in fact the size at the target volume does not grow ( since there are no more data ). After it successfully finished the copy, i tried what will happen with the --copy-storage-inc parameter: [root@nodeB ~]# virsh migrate --copy-storage-inc --verbose --live kvm1776 qemu+ssh://nodea/system But that didnt change anything. Even both volumes are identical now, again the whole copy of all ( non existing ) 100GB. Is there any way to make libvirt just copy real data and not Zero's that actually do not exist and causing network and HDD IO traffic ? Thank you ! -- Mit freundlichen Gruessen / Best regards Oliver Dzombic Layer7 Networks mailto:info@layer7.net Anschrift: Layer7 Networks GmbH Zum Sonnenberg 1-3 63571 Gelnhausen HRB 96293 beim Amtsgericht Hanau Geschäftsführung: Oliver Dzombic UST ID: DE259845632