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[Xen-users] Some HVM Live Migration Issues

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Some HVM Live Migration Issues
From: "Shuveb Hussain" <shuveb@xxxxxxxxx>
Date: Tue, 23 Oct 2007 23:27:10 +0530
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I am using LVM-over-iSCSI and have 2 SVM enabled nodes. I am using
OpenFiler as an iSCSI target system on a 3rd node. I have created LVM
partitions on the iSCSI LUNs. From both nodes, I am able to create
domUs and run them without issues. Just a few questions:

1. Do I need a cluster file system in this kind of a setup? No 2 domUs
will access a LUN simultaneously from different nodes. This setup is
just to facilitate domU migration.

2.  I have 2 LVM logical volumes: /dev/vms/winxp and /dev/vms/centos5.
I am able to create and run HVM domUs from either nodes without
issues. Live Migration does not work the first time from Node1 ->
Node2 or from Node2 -> Node 1. But if I create the XP domain once on
Node1, shut it down, then create it once more on Node 2 and then
migrate, it works. Really weird, but this is how it is. Looking at the
logs, everything looks fine. Just that the domain won't start after it
has migrated the first time. I think there is an issue initializing
the iscsi LUN in some way or the other.... but I can't make out.

3. The network stops working after a live migration. The Windows XP
domain reports that the cable has been "unplugged". I thought this
might be an ARP issue, but I kept forcing network activity with long
gaps in between. This never helped, though. What might the issue be?

Shuveb Hussain.
Money has nothing to do with Happiness,
But, Poverty has a lot to do with Sorrow.
Company: www.binarykarma.com
Blog: www.binarykarma.org

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