Created attachment 615104 [details]
virt-manager --debug

Instalation via virt-manager, when lvm is used as default storage fails:
summary=Unable to complete install: 'unsupported configuration: native I/O
needs either no disk cache or directsync cache mode, QEMU will fallback to
aio=threads'
details=Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in
cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/create.py", line 1958, in
do_install
    guest.start_install(meter=meter)
  File "/usr/share/virt-manager/virtinst/guest.py", line 428, in start_install
    noboot)
  File "/usr/share/virt-manager/virtinst/guest.py", line 492, in _create_guest
    dom = self.conn.createLinux(start_xml or final_xml, 0)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3464, in
createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed',
conn=self)
libvirtError: unsupported configuration: native I/O needs either no disk cache
or directsync cache mode, QEMU will fallback to aio=threads



# systemctl status libvirtd
libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled)
   Active: active (running) since Wed 2014-11-26 14:30:16 CET; 20min ago
     Docs: man:libvirtd(8)
           http://libvirt.org
 Main PID: 1345 (libvirtd)
   CGroup: /system.slice/libvirtd.service
           ������1345 /usr/sbin/libvirtd --listen
           ������1680 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/vnet0.conf
--dhcp-script=/usr/lib64/libvirt/libvirt_leaseshelper
           ������1681 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/vnet0.conf
--dhcp-script=/usr/lib64/libvirt/libvirt_leaseshelper

Nov 26 14:30:17 medusa dnsmasq[1680]: compile time options: IPv6 GNU-getopt
DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC
Nov 26 14:30:17 medusa dnsmasq-dhcp[1680]: DHCP, IP range 192.168.100.128 --
192.168.100.254, lease time 1h
Nov 26 14:30:17 medusa dnsmasq-dhcp[1680]: DHCP, sockets bound exclusively to
interface virbr0
Nov 26 14:30:17 medusa dnsmasq[1680]: reading /etc/resolv.conf
Nov 26 14:30:17 medusa dnsmasq[1680]: using nameserver 10.100.2.10#53
Nov 26 14:30:17 medusa dnsmasq[1680]: using nameserver 10.100.2.8#53
Nov 26 14:30:17 medusa dnsmasq[1680]: read /etc/hosts - 7 addresses
Nov 26 14:30:17 medusa dnsmasq[1680]: read
/var/lib/libvirt/dnsmasq/vnet0.addnhosts - 0 addresses
Nov 26 14:30:17 medusa dnsmasq-dhcp[1680]: read
/var/lib/libvirt/dnsmasq/vnet0.hostsfile
Nov 26 14:47:48 medusa libvirtd[1345]: End of file while reading data:
Input/output error