Re: [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints

[Wen Congyang]

On 07/09/2015 05:16 PM, Dr. David Alan Gilbert wrote:
> * Wen Congyang (address@hidden) wrote:
> 
>>>> I have sent the v8. But the usage is not changed. You can setup the 
>>>> environment according to the wiki.
>>>> When we open nbd client, we need to connect to the nbd server. So I 
>>>> introduce a new command child_add to add NBD client
>>>> as a quorum child when the nbd server is ready.
>>>>
>>>> The nbd server is ready after you run the following command:
>>>> nbd_server_start 0:6262 # the secondary qemu will listen to host:port
>>>> nbd_server_add -w mc1   # the NBD server will know this disk is used as 
>>>> NBD server. The export name is its id wc1.
>>>>                         # -w means we allow to write to this disk.
>>>>
>>>> Then you can run the following command in the primary qemu:
>>>> child_add disk1 
>>>> child.driver=replication,child.mode=primary,child.file.host=127.0.0.1,child.file.port=6262,child.file.export=mc1,child.file.driver=nbd,child.ignore-errors=on
>>>>
>>>> After this monitor command, nbd client has connected to the nbd server.
>>>
>>> Ah! The 'child.file.export=mc1' wasn't there previously; I see Yang added 
>>> that to the wiki yesterday;
>>> that probably explains the problem that we've been having.
>>
>> Sorry for this mistake.
> 
> OK, so this is working for me (with the 7.2 world).   What isn't working in 
> this setup is migrate -b, I get:
> 
> (qemu) Receiving block device images
> Error unknown block device disk1
> qemu-system-x86_64: error while loading state section id 1(block)
> qemu-system-x86_64: load of migration failed: Invalid argument
> 
> Can you explain the id=disk1 on the master side?

Can you give me the command line? I think the id in primary and secondary qemu 
is not same.

Thanks
Wen Congyang

> 
> Dave
> 
>>
>> Thanks
>> Wen Congyang
>>
>>>
>>> Dave
>>>
>>>>
>>>> Thanks
>>>> Wen Congyang
>>>>
>>>>>
>>>>> - Michael
>>>>>
>>>>> .
>>>>>
>>>>
>>>>
>>> --
>>> Dr. David Alan Gilbert / address@hidden / Manchester, UK
>>> .
>>>
>>
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK
> .
>