It seems that there is a bit of a bug in the Hyper-V export function if the destination for the export is receiving data slower than the source is sending it. The export function will continue to cache the export in all available memory until the server stops responding due to memory being exhausted.
- Microsoft Support KB 2547551: Hyper-V Export function consumes all available memory in Windows Server 2008 or in Windows Server 2008 R2
Prior to running any export processes on a production server this hotfix should be applied.
Examples where the problem hits is when the export is being run to a USB hard disk that runs at 30MB/Second or across a slower LAN link to another server.
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book