creating a new virtual machine, installation process via virt-manager hangs

[Matthias Gier]

This problem concerns a 7-node cluster, based on Ubuntu 12.04 and KVM.
There are 3 shared SAN-Cluster-sources, one of which is containing the virtual machine files.
From one node, virtual machines are generated via virt-manager.
Now I tried twice to install Ubunto 12.10 on a new vm; at different points of the installation process, the installation stops (while the animation screens of the installation routine are selectable furthermore).
In this situation, the complete cluster looses connect to the SAN-device and several other vm's die.
ls, gfs2_tool on /mnt/sanx are hanging endless;
Only a reboot of node 1 can solve this situation.

In earlier times, I had the same experiences installing Debian_6 (reproducable).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: virt-manager 0.9.1-1ubuntu5.1
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
Date: Fri Sep 14 08:59:10 2012
InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: virt-manager
UpgradeStatus: Upgraded to precise on 2012-04-27 (139 days ago)

[Matthias Gier (mgier)]

Additional info: This problem only happens on QCOW2-VM's not RAW-VM's!