8:46 p.m.
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!
8:19 a.m.
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(a)redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
9:18 a.m.
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(a)redhat.com> 写道：
发件人: Eric Blake <eblake(a)redhat.com>
主题: Re: [libvirt-users] live migration
收件人: "hcyy" <caiyanyang(a)yahoo.com.cn>
抄送: libvirt-users(a)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(a)redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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