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Connection Drops During Live Migration

Posted on 2010-11-08
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Last Modified: 2012-06-27
I put one of our blades in maintenance mode and all guest machines were migrated to other hosts in the cluster using live migration. However, some users that have desktop redirection and running network-sensitive applications lost the connections with the applications running on one of the guests.

Checking the server involved, I see about 20 occurences of Event ID 2012: "While transmitting or receiving data, the service encountered a network error." There are more of these scattered about in the system log, but not in a group like this. There aer no other errors in the logs at the time the server was put in maintenance mode.

I thought live migration was supposed to be seamless. Is there something else we can do to ensure proper load balancing on our hyper-v cluster without connections being dropped?
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Question by:Brian B
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Expert Comment

by:bgoering
ID: 34092837
What is your network infrastructure. What kind of network switch, NIC cards, etc.?
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Expert Comment

by:msmamji
ID: 34096300
The only reason, I can think of having loss of connectivity is that maybe the VM is on a separate LUN which is not CSV meaning the VM files (vhd, config, bin, vsv, snapshot) are residing on a LUN that is not CSV.
CSV not Required for Live Migration

If how ever that is not the case, I would advise to have a look at this.
Windows Server 2008 R2 Live Migration – “The devil may be in the networking details.”

Regards,
Shahid
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by:Brian B
ID: 34096695
Those links are a good read, thanks. From what I read there, I should add that the cluster has passed all checks for high availability and all the other servers have migrated with no problems.

Environment is a four blade cluster connected to a pair of teamed Cisco 35xx switches via 10Gb ethernet pair. Then 64 1 Gb connections to EqualLogic 6000 iSCSI SAN with 8 shelves.

The services running on the server enver dropped during migration, but I did find these errors, and our network monitoring tool did see a dropped connection to the server being migrated.
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Brian B earned 0 total points
ID: 34103637
More information. If I log on to the server being migrated and ping -t to another server, response time is always <1ms. However, if I ping from another server to the server being migrated, it times out two or three times during the process. So that may be why the applications are reporting issues.
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Author Closing Comment

by:Brian B
ID: 34179075
Solutions presented didn't answer the question.
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