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


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH COLO v3 01/14] docs: block replication's description
Date: Fri, 24 Apr 2015 09:47:02 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0


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.

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

Paolo



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