/tags/libvirt/Recent content in Libvirt on LifeHugoen-usMon, 13 Jan 2014 18:36:00 +0530/post/2014/2014-01-13-shrink-vms-on-virt-manager-kvm/Mon, 13 Jan 2014 18:36:00 +0530/post/2014/2014-01-13-shrink-vms-on-virt-manager-kvm/<p>I use <code>rsync</code> to back up my workstation, including virtual machine disk images. Due to a known issue with sparse file handling during backups, <code>rsync</code> would expand sparse files, inflating an 11 GB disk image to its full 64 GB provisioned size on the backup server.</p> <p>To solve this, I converted the disk images to compressed <code>qcow2</code> format:</p> <h3 id="1-convert-existing-raw-images-to-qcow2">1. Convert Existing Raw Images to qcow2</h3> <p>This also enables live snapshot support in <code>virt-manager</code>:</p>/post/2014/2014-01-12-windows-7-on-kvm-high-cpu-usage-on-host-while-guest-is-idle/Sun, 12 Jan 2014 21:00:00 +0530/post/2014/2014-01-12-windows-7-on-kvm-high-cpu-usage-on-host-while-guest-is-idle/<p>If you notice unusually high CPU usage on your KVM host while a Windows 7 virtual machine sits completely idle, remove the virtual USB tablet input device from the VM configuration. Once removed, host CPU utilization drops immediately.</p> <p><img alt="Windows 7 CPU Usage Screenshot" loading="lazy" src="../../post/2014/images/win7-kvm-cpu-usage.png"></p> <p><strong>Reference:</strong> <a href="http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=672720">Debian Bug 672720</a></p>