Re: Network connection with COLO VM

[Daniel Cho <danielcho@qnap.com>]

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Hi David,  Zhang,

Thanks for replying my question.
We know why will occur this issue.
As you said, the COLO VM's network needs
colo-proxy to control packets, so the guest's
interface should set the filter to solve the problem.

But we found another question, when we set the
fault-tolerance feature to guest (primary VM is running,
secondary VM is pausing), the guest's network would not
responds any request for a while (in our environment
about 20~30 secs) after secondary VM runs.

Does it be a normal situation, or a known issue?

Our test is creating primary VM for a while, then creating
secondary VM to make it with COLO feature.

Best Regard,
Daniel Cho

Zhang, Chen <chen.zhang@intel.com> 於 2019年11月28日 週四 上午9:26寫道：

>
>
> > -----Original Message-----
> > From: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > Sent: Wednesday, November 27, 2019 6:51 PM
> > To: Daniel Cho <danielcho@qnap.com>; Zhang, Chen
> > <chen.zhang@intel.com>; lukasstraub2@web.de
> > Cc: qemu-devel@nongnu.org
> > Subject: Re: Network connection with COLO VM
> >
> > * Daniel Cho (danielcho@qnap.com) wrote:
> > > Hello everyone,
> > >
> > > Could we ssh to colo VM (means PVM & SVM are starting)?
> > >
> >
> > Lets cc in Zhang Chen and Lukas Straub.
>
> Thanks Dave.
>
> >
> > > SSH will connect to colo VM for a while, but it will disconnect with
> > > error
> > > *client_loop: send disconnect: Broken pipe*
> > >
> > > It seems to colo VM could not keep network session.
> > >
> > > Does it be a known issue?
> >
> > That sounds like the COLO proxy is getting upset; it's supposed to
> compare
> > packets sent by the primary and secondary and only send one to the
> outside
> > - you shouldn't be talking directly to the guest, but always via the
> proxy.  See
> > docs/colo-proxy.txt
> >
>
> Hi Daniel,
>
> I have try ssh to COLO guest with 8 hours, not occurred this issue.
> Please check your network/qemu configuration.
> But I found another problem maybe related this issue, if no network
> communication for a period of time(maybe 10min), the first message send to
> guest have a chance with delay(maybe 1-5 sec), I will try to fix it when I
> have time.
>
> Thanks
> Zhang Chen
>
> > Dave
> >
> > > Best Regard,
> > > Daniel Cho
> > --
> > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>
>

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