“thin provisioning” means “virtually” allocate more harddisk space, than the harddisk (physically) has, then grow the virtual harddisk file according to it’s needs (store more files = size of harddisk.img grows dynamically)

# debian 10; # tested

via bash terminal: to create a thin provisioned harddisk images of capacity of a 32GB capacity via  go:

qemu-img create -f qcow2 name-of-harddisk-image.qcow2 1024G

(as VirtualBox does per default via the gui)

then when creating a new virtual machine with virt-manager, select the just created name-of-harddisk-image.qcow2

the gui way of doing that:

(only possible in newer version of virt-manager)

# 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

creditz:

https://forums.unraid.net/topic/44246-thin-provisioning/

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