Over allocate host HD space - social. technet. microsoft. com Here is an interesting issue I ran into today I have a 3node hyper v failover cluster using CSV One of my CSV reached 100% utilized and all VM's that were stored on this volume were put in a 'paused' state I extended the LUN on my SAN and used diskpart to extend the partition Then all the VM's that were paused rebooted and were fine