Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

A systems administrator has deployed a new virtual machine on a Linux host that uses QEMU/KVM. The VM's only system disk is a qcow2 image attached to an emulated IDE controller. During large file copies inside the guest, disk throughput remains low and the host's CPU usage rises sharply. The administrator wants to keep the disk as a qcow2 file on the host and avoid hardware passthrough, but still obtain near-native I/O performance and lower CPU overhead. Which change to the VM's libvirt XML definition will provide the greatest improvement?

  • Convert the qcow2 image to raw format but retain the IDE controller.

  • Enable snapshot (overlay) mode on the qcow2 image to defer writes.

  • Change the disk device model from IDE to a virtio paravirtualized block device and install the matching driver in the guest.

  • Attach the virtual disk through USB redirection instead of IDE.

CompTIA Linux+ XK0-006 (V8)
System Management
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