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Re: [Xen-users] Network drops after live migration of PV

  • To: "Jason Solan" <jsolan@xxxxxxxxxxxxxxxxxxxx>
  • From: mail4dla@xxxxxxxxxxxxxx
  • Date: Mon, 16 Jul 2007 18:09:56 +0200
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 16 Jul 2007 09:07:46 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

What you are experiencing is the effect of the switch caching the information to which of its ports a given MAC address is connected to. It will expire after a certain period of time or if a packet with a MAC address is received through a different port. If you run an output generating process over ssh, this is what happens.
If you still have one, connect the two Xen hosts to the same hub and you should no longer experience the network outage.

On 7/16/07, Jason Solan < jsolan@xxxxxxxxxxxxxxxxxxxx> wrote:
  We are running Xen 3.0.3 on Red Hat Enterprise Linux 5.  We have a
couple of paravirtualized systems running Fedora 6 located on a NFS
The servers we are trying to migrate between are identical and on the
same subnet.
When we do a live migration from one to the other, the network for the
vm drops off.  If we log into the console of the vm from the xen server
and ping outwards, then the network for the vm starts working again.  If
we have an ssh session on the vm that is actually doing work (i.e.
`find /` ) during the live migration, then the network seems to come up
right away on its own.

Has anyone else seen this?

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