Posts Tagged ‘HowTo’

Festplatten-Aktivität bei QNAP in den Griff kriegen

Im Privatgebrauch habe ich ein QNAP-NAS (459 Pro+, Firmware 3.8.3). Es dient als Backup-Speicher und als zentrales Lager für Musik. Anders als “normale” Server, muss es also nicht durchgängig laufen. Wie ich meinen Stromverbrauch reduziert habe, beschreibe ich hier. Read the rest of this entry »

Setting up a Ubuntu 12.04 Guest as HVM, Converting it to PV

With Ubuntu 12.04 it’s remarkably simple to convert a HVM guest to PV. This will probably work in much the same way with Ubuntu 12.10 as well. Here’s what i did:


  • VM Host running Xen 4.1 or later (mine is running the default packages provided by debian 6 / squeeze)
  • A spare drive (will also work with a disk-image-file)
  • Ubuntu Server installation ISO

Installation Phase

In the installation phase, i am running this machine as a HVM machine. The config can be found below. I basically give it a hard disc and the CD-ISO as disks and tell it to boot from CD. Everything else is pretty much default.

# Hostname
name    = 'machine'

# HVM-Loader.
kernel  = '/usr/lib/xen-4.0/boot/hvmloader'
builder = 'hvm'

memory  = 2048
shadow_memory = 8
vcpus   = 2

disk    = [
           'phy:/dev/loop21,ioemu:hdc:cdrom,r' # i need to loop CD-Isos, not sure, why.

#  Networking
vif         = [ 'mac=11:22:33:44:55:66,bridge=br0' ]

vncpasswd = 'setup-something-nice'

Fire up your machine with xm create machine.cfg and connect to it via VNC. Install Ubuntu the way you like.

Converting to PV

After the setup, i usually turn the machine off and mount the hard-disk on the VM host. I alter two things: I add a /etc/init/hvc0.conf (which is a copy from /etc/init/tty1.conf with slight alterations) and i put some static settings into /etc/network/interfaces.

I then reboot the machine with this Xen-Config:

name        = 'machine'
kernel      = '/boot/vmlinuz-3.2.0-31-generic'
ramdisk     = '/boot/initrd.img-3.2.0-31-generic'
root        = '/dev/xvda1 ro,console=hvc0'

memory      = '2048'
vcpus       = '2'

disk        = [

vif         = [ 'mac=11:22:33:44:55:66,bridge=br0' ]

on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'


Claudius Coenen is a tech-enthusiast. He's writing on all kinds of topics, including programming, technology, gadgets and media.

This site features his occasional articles, findings, documentations.



RSS Recent Bookmarks