thank you!
could you show me a xml example for live migration?
I think maybe i have something wrong in it?
it is my xml :
<domain type='kvm'>
  <name>vm12</name>
  <uuid>7d620b81-ab66-a1df-9d36-38df867c3108</uuid>
  <memory>5000000</memory>
  <currentMemory>5000000</currentMemory>
  <vcpu>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-1.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/share/vm12.img'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </disk>
    <interface type='bridge'>
      <mac address='52:54:00:20:ca:c1'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='5912' autoport='no' keymap='en-us'/>
    <sound model='ich6'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </sound>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </memballoon>
  </devices>
</domain>
           
--- 12年7月10日，周二, Eric Blake <eblake@redhat.com> 写道：

发件人: Eric Blake <eblake@redhat.com>
主题: Re: [libvirt-users] live migration
收件人: "hcyy" <caiyanyang@yahoo.com.cn>
抄送: libvirt-users@redhat.com
日期: 2012年7月10日,周二,下午9:19

On 07/10/2012 06:46 AM, hcyy wrote:
> Hello, everybody.     I use NFS to do live migration。After input  virsh
> --connect=qemu:///system --quiet migrate --live vm12 qemu+tcp://pcmk-1/system  (vm12  is vm name,/pcmk-1 is host name)it use almost 10s for preparation. During the 10s,the vm is still runing and can ping other vm. But if i input mkdir pcmk-6 in vm during the 10s,it say :mkdir: cannot create directory `pcmk-6': Read-only file system.     Anybody can tell me this situation is due to my wrong configure or libvirt cannot mkdir during migration？thanks!

The act of migration should not be guest-visible, so if you are seeing a
read-only directory from within your guest, it is most likely some other
issue and not migration itself that caused the problem.

--
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org