VMs on external storage CPU overloading

[john doe <johndoe65534@mail.com>]

Hi Debians,

I have limited space on my box, so I would like to install VMs onto an
external storage (usbkey 3.0) using Libvirt.

In the below command '/mnt/usbkey01' is the mountpoint for my usbkey:

virt-install --name=try01 --ram=1024
--disk=path=/mnt/usbkey01/machines/try01,size=6


My CPU overloads like crazy.

The overloading is related by the use of this usbkey but I don't
understand why?:
- Is this a Debian issue
- Is this a Libvirt issue
- Is this expected because I'm using virtualisation with KVM enabled


Other then increasing the size of my internal storage, can I do
something about it?


If I change the path to '/var/lib/machines/try01' (internal storage) it
works flowlessly and my CPU does not overload.


Any input is appriciated.

--
John Doe