With System Center 2012 Virtual Machine Manager (VMM 2012) SP1, we now allow multiple migrations to occur and we can specify the maximum number of concurrent migration jobs in the properties of the host. What this means is that if we set the migration value to 2 then the third migration job will be queued until one of the earlier jobs is complete, and by default this job will wait 15 minutes before it times out and fails the job. If you’re seeing migration timeout errors then you can increase that time with a simple Registry tweak. See the KB article below for all the details:
KB2790310 - How to increase the timeout for Migration Jobs in System Center 2012 Virtual Machine Manager (http://support.microsoft.com/kb/2790310)
J.C. Hornbeck| Knowledge Engineer | Management and Security Division
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