kvm / libvirt virtual machine freeze

["Georg Damm" <Georg.Damm@freenet.de>]

Hallo Liste,

ich habe debian wheezy installiert. Unter kvm läuft eine clonezilla-
VM, mit der ich Rechner clonen möchte. Leider bricht die 
Datenübertragung beim Sichern und Wiederherstellen immer wieder ab 
und ich komme weder über ssh noch über vnc mehr an die VM heran. Ich 
habe alle virtuellen Netzwerkkarten ausprobiert und stelle nur eine 
Verbesserung fest, wenn ich die Karte nach einem Shutdown ändere. 
Allerdings verzögert dies maximal den Zeitpunkt bis die vm wieder 
nicht erreichbar ist.
Gibt es eine Möglichkeit den Fehler zu lokalisieren? In den Logs des 
Server und der VM steht nichts verdächtiges. Ähnliches habe ich 
schon zuvor unter 32bit lenny beobachtet. Gibt es eine Möglichkeit, 
das Problem einzugrenzen?

Georg Damm

HOST:
---------

root@wilson:~# uname -a
Linux wilson 3.0.0-1-amd64 #1 SMP Sat Aug 27 16:21:11 UTC 2011 
x86_64 GNU/Linux

root@wilson:~# dpkg -l | grep libvirt
ii  libvirt-bin                        0.9.4-2                           
programs for the libvirt library
ii  libvirt0                           0.9.4-2                           
library for interfacing with different virtualization systems
ii  python-libvirt                     0.9.4-2                           
libvirt Python bindings


root@wilson:~# virsh dumpxml clonezilla
<domain type='qemu' id='18'>
  <name>clonezilla</name>
  <uuid>dcb380d8-4597-a96a-a447-5f672347d250</uuid>
  <memory>2890752</memory>
  <currentMemory>2656256</currentMemory>
  <vcpu>4</vcpu>
  <os>
    <type arch='i686' machine='pc-0.14'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <apic/>
    <pae/>
  </features>
  <cpu match='exact'>
    <model>Westmere</model>
    <vendor>Intel</vendor>
    <feature policy='require' name='tm2'/>
    <feature policy='require' name='est'/>
    <feature policy='require' name='monitor'/>
    <feature policy='require' name='ss'/>
    <feature policy='require' name='vme'/>
    <feature policy='require' name='rdtscp'/>
    <feature policy='require' name='ht'/>
    <feature policy='require' name='ds'/>
    <feature policy='require' name='pbe'/>
    <feature policy='require' name='tm'/>
    <feature policy='require' name='vmx'/>
    <feature policy='require' name='ds_cpl'/>
    <feature policy='require' name='xtpr'/>
    <feature policy='require' name='acpi'/>
    <feature policy='require' name='x2apic'/>
  </cpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/qemu</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='threads'/>
      <source file='/vm/clonezilla.img'/>
      <target dev='hda' bus='ide'/>
      <alias name='ide0-0-0'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='threads'/>
      <source dev='/dev/vg_wilson/vm_clonezilla_dir_backup'/>
      <target dev='hdb' bus='ide'/>
      <alias name='ide0-0-1'/>
      <address type='drive' controller='0' bus='0' unit='1'/>
    </disk>
    <controller type='ide' index='0'>
      <alias name='ide0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x1'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <alias name='virtio-serial0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' 
function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:c5:bd:35'/>
      <source bridge='intern'/>
      <target dev='vnet0'/>
      <model type='e1000'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' 
function='0x0'/>
    </interface>
    <interface type='bridge'>
      <mac address='52:54:00:9c:7f:45'/>
      <source bridge='brclone'/>
      <target dev='vnet1'/>
      <model type='e1000'/>
      <alias name='net1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' 
function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/0'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <serial type='pty'>
      <source path='/dev/pts/2'/>
      <target port='1'/>
      <alias name='serial1'/>
    </serial>
    <console type='pty' tty='/dev/pts/0'>
      <source path='/dev/pts/0'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <input type='tablet' bus='usb'>
      <alias name='input0'/>
    </input>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='5900' autoport='yes'/>
    <sound model='ich6'>
      <alias name='sound0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' 
function='0x0'/>
    </sound>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' 
function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' 
function='0x0'/>
    </memballoon>
  </devices>
</domain>

GAST:
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Debian squeeze 32 bit