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Re: [Libguestfs] Thoughts on nbdkit automatic reconnection

On Thu, Sep 19, 2019 at 07:18:29AM -0500, Eric Blake wrote:
> On 9/19/19 4:50 AM, Richard W.M. Jones wrote:
> > On Wed, Sep 18, 2019 at 01:59:01PM +0100, Richard W.M. Jones wrote:
> >> We have a running problem with the nbdkit VDDK plugin where the VDDK
> >> side apparently disconnects or the network connection is interrupted.
> >> During a virt-v2v conversion this causes the entire operation to fail,
> >> and since v2v conversions take many hours that's not a happy outcome.
> >>
> >> (Aside: I should say that we see many cases where it's claimed that
> >> the connection was dropped, but often when we examine them in detail
> >> the cause is something else.  But it seems like this disconnection
> >> thing does happen sometimes.)
> > 
> > It turns out in the customer case that led us to talk about this, a
> > Checkpoint firewall was forcing the VDDK control connection to be
> > closed after an idle period.
> Would TCP keepalive help here?

Seems as if VDDK already sets this, but perhaps only on the data
connection (as usual the documentation is atrocious).


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
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