Hello,<br><br>I&#39;m using libvirt to deploy a series of 7 KVM (in qcow2 format) sequentially. The base image of the qcow2 is an ubuntu server.<br><br>The environment where i am doing this is a Live USB Ubuntu with a persistence file (so that changes made remain).<br>

<br><br>So, my problem:<br><br>* If the persistence file (i.e. free disk space in the live ubuntu) is up to around 1.5GB, the qemu process of launching the first one of the KVM gets stuck, and a few seconds later an Ubuntu message pops up saying there is no disk space left.<br>

<br>* If the persistence file is a bit bigger (100 MB more), it can launch the 7 KVM machines without any disk space problems.<br><br><br>This would suggest that during the deployment of one virtual machine, there is a short period of time where a big amount of disk space (similar to the size of the base image) is used (even if i am using qcow2 vms) and afterwards released, so it can be used to launch the second vm, released, used for the third, and so on.<br>

<br>If this is correct, i would like to know who is using that space, since my intention would be to, if possible, redirect this temporary disk usage to a RAM filesystem such as tmpfs, so that i don&#39;t need such a huge persistence file in the USB.<br>

<br><br>I&#39;m aware that this might be related to qemu-kvm rather than to libvirt itself, but i can&#39;t find information about it and i would appreciate if anyone could point me in the right direction. More details or clarification can be provided if needed.<br>

<br>Best regards,<br>Jorge<br><br>