Last week I moved our SCVMM from 2012 with service pack 1 to 2012 R2. Whilst the actual process was much simpler than I expected, we had a pretty big constraint imposed upon us by Lab Manager that largely dictated our approach.
Our SCVMM 2012 deployment was running on an aging Dell server. It had a pair of large hard drives that were software mirrored by the OS an we were using NIC teaming in Server 2012 to improve network throughput. It wasn’t performing that well, however. Transfers from the VMM library hosted on the server to our VM hosts were limited by the speed of the ageing SATA connectors and incoming transfers were further slowed by the software mirroring. We also had issues where Lab manager would timeout jobs whilst SCVMM was still diligently working on them.