Extending Hyper-V Passthrough Volume on a Hyper-V Failover Cluster

I would like to know the best practice for extending a LUN and associated Windows partition structure on a Hyper-V 2.0 (R2 SP1) passthrough disk on a failover cluster. I have watched this done before and it seems fraught with issues, most notably having to rescan all nodes of the cluster to get the new LUN size to be recognized (the cluster seems to catch up after a couple of hours with its own scan). We also get IO errors on the MPIO when doing this.

On the same topic - is there an issue with doing an extension of a CSV and underlying LUN while online?

Thanks,

Dana