[libvirt-users] live migration

[Michal Privoznik]

On 24.02.2015 16:10, Thomas Stein wrote:
> On Tuesday 24 February 2015 14:56:10 Michal Privoznik wrote:
>> On 24.02.2015 14:29, Thomas Stein wrote:
>>> Hola.
>>>
>>> Just tried a live migration after fixing the pc-q35-2.1 error. Now i
>>> have new problem. It seems during live migration only the ram gets
>>> migrated. I use the following command.
>>>
>>>  # virsh migrate --live domain qemu+ssh://newhost/system
>>>
>>> --copy-storage-all --verbose --persistent
>>>
>>> It works without problems. Apart from beeing way to fast.
>>>
>>>  # virsh migrate --live domain qemu+ssh://newhost/system
>>>
>>> --copy-storage-all --verbose --persistent
>>> Migration: [100 %]
>>>
>>> On the destination i can enter the VM but thats it. There is no
>>> filesystem and so on.
>>>
>>> Did the migration syntax change?
>>>
>>> I use libvirt 1.2.12 and qemu 2.2.0. Thanks for any hints.
>>
>> Only RW disks are copied. You have to copy RO, sourceless or shared
>> disks yourself.
> 
> Thanks for your answer. But what do you mean by "rw disks"? I chmod(ed) a+rw 
> all images but the issue still exists.
> 

Those are two separate things. One is the Linux permissions over a file,
the other is disk (which doesn't have to be necessary a regular file)
and set of actions guest is allowed to do over it. RO disk contains
'readonly="yes"' in its XML definition in domain XML. If there's none,
disk is RW. A sourceless disk contains no <source/>, shared disk
contains 'shared="yes"' and so on.

Michal