[sheepdog-users] sheepdog 0.9 vs live migration

[Hitoshi Mitake]

At Fri, 12 Dec 2014 10:16:30 +0100,
Jónás Zsolt wrote:
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> Hi,
> 
> 
> I'm testing sheepdog 0.9 on two hosts.
> 
> 
> I tried to do kvm live migration:
> $ virsh migrate --live test-vm qemu+ssh://test-host2/system
> 
> 
> but I get the following error:
> error: internal error: process exited while connecting to monitor: 
> qemu-system-x86_64: -drive 
> file=sheepdog:test-vm-disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: 
> cannot get vdi info, VDI is already locked, test-vm-disk 0
> qemu-system-x86_64: -drive 
> file=sheepdog:test-vm-disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: 
> could not open disk image sheepdog:test-vm-disk: Could not open 
> 'sheepdog:test-vm-disk': Input/output error
> 
> 
> the VDI is locked by dog:
> $ dog vdi lock list
> VDI | owner node
> test-vm-disk | IPv4 ip:test-host1 port:7000
> 
> 
> if I remove the VDI lock the live migration works correctly:
> $ dog vdi lock unlock test-vm-disk
> 
> but after the live migration I can't relock the VDI.
> 
> 
> VM disk definition:
>      <disk type='network' device='disk'>
>        <driver name='qemu' type='qcow2' cache='none'/>
>        <source protocol='sheepdog' name='test-vm-disk'/>
>        <target dev='vda' bus='virtio'/>
>      </disk>
> 
> 
> How can I do the live migration safely with sheepdog 0.9?
> Or what am I doing wrong?
> 
> 
> os: Ubuntu 14.04.1 LTS
> qemu: QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.7)
> sheepdog: Sheepdog daemon version 0.9.0
> 
> 
> Thank you for your help!

Hi Jónás,

Thanks for your report. As you say, live migration and vdi locking
seem to be conflicted. I'll work on it later. But I'm not familiar
with qemu's live migration feature, so it would take time. Could you
add an issue to our launchpad tracker for remainder?

https://bugs.launchpad.net/sheepdog-project

Thanks,
Hitoshi


> 
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> jonci
> 
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