john doe wrote: > 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.
Two things: - your CPU load, depending on how you measure it, may include processes which are waiting for I/O. This I/O is very slow, so. - not all USB3 devices are the same. Many implement a single-request system, where the kernel is only allowed to make a read or write call, then wait for the response, then issue the next call. Anything describing itself as a "key" is particularly likely to have this. Can you change your external storage? -dsr-
