I have 6 Hyper-V hosts (all windows 2012 R2) managed by VMM 2012 R2.
The all use the same File Share on the same File Server (Windows 2012 R2) for all of their storage.
Live Migration from VMM Console between these hosts usually works like a charm.
I just tried to live migrate a vm with a very large vhdx-file located on the file share. VMM complained in the placement dialog that "There is not enough disk space on the available volumes". It correctly quoted the size of the vhdx file and the free space on the file server and refused to allow the migration because the vhdx was larger that the free space.
Why does this happen? It does not need any additional space since it will just leave the files in place and move memory between the hosts.
It was urgent, so I freed up some space and was then able to complete the migration.
