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Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's descrip


From: Wen Congyang
Subject: Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description
Date: Fri, 24 Apr 2015 15:55:46 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

On 04/24/2015 03:47 PM, Paolo Bonzini wrote:
> 
> 
> On 24/04/2015 04:16, Wen Congyang wrote:
>>>>>> I think the primary shouldn't do any I/O after failover (and the
>>>>>> secondary should close the NBD server) so it is probably okay to ignore
>>>>>> the removal for now.  Inserting the filter dynamically is probably
>>>>>> needed though.
>>>>
>>>> Or maybe just enabling/disabling?
>> Hmm, after failover, the secondary qemu should become primary qemu, but we 
>> don't
>> know the nbd server's IP/port when we execute the secondary qemu. So we need
>> to inserting nbd client dynamically after failover.
> 
> True, but secondary->primary switch is already not supported in v3.

Yes, we should consider it, and support it more easily later.

If we can add a filter dynamically, we can add a filter that's file is nbd
dynamically after secondary qemu's nbd server is ready. In this case, I think
there is no need to touch nbd client.

Thanks
Wen Congyang

> 
> Kevin/Stefan, is there a design document somewhere that covers at least
> static filters?
> 
> Paolo
> .
> 




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