I have installed KVM and left the system to decide how big the Hd should be (default 8Gb) and after unstalling XP Pro and Win7, both Hd’s are reporting as full. Is there any way I can increase the size of the Hd’s without having to go through the setup of creating a new VM for each one?
Also, is it a ‘virtual’ size or a real size that takes up ‘real’ size of my Hd?
I’m still not 100% sure what you mean … but when you create a virtual machine it’s just that, a virtual machine (as in virtual hardware) so the hard drive the VM uses is “virtual” (saved as a file somewhere).
VirtualBox (by default) saves them as a “.vdi” (virtual disk image) at ~/Virtualbox … but I have no idea where KVM/virt-manager saves them, or the format.
You should have unticked the “Allocate entire virtual disk now” box whilst configuring the storage space when you created the VM … then the virtual HDD would have dynamically adjusted its own size when it started to fill up.