tested on host
# debian 10
this option is only available in the gui on newer versions of virsh-manager
to create a thin provisioned harddisk of capacity of 32GB image via bash-terminal go:
qemu-img create -f qcow2 name-of-harddisk-image.qcow2 32G
as in VirtualBox, is it possible to create bigger virtual harddisks on smaller physical harddisks, by think provisioning qcow2 format (kvm default)
but per default, virt-manager says “can not create such disk files”… but it can:
# real disk size du -hs /home/user/vms/debian10 81M # maximum allowed disk size ls -lah /home/user/vms/debian10 -rw------- 1 libvirt-qemu libvirt-qemu 513G Aug 1 14:05 /home/user/vms/debian10