Your network contains an Active Directory domain named contoso.com. The domain contains two servers
named Server1 and Server2 that run Windows Server 2012 R2. Server1 is a file server that has the Hyper-V
server role installed.
Server1 hosts several virtual machines. The virtual machine configuration files are stored on drive D and the
VHD files are stored on drive E.
You plan to replace drive E with a larger volume.
You need to ensure that the virtual machines on Server1 remain available while drive E is being replaced.
What should you do?
A.
Perform a quick migration.
B.
Add Server1 and Server2 as nodes in a failover cluster.
C.
Perform a live migration.
D.
Perform a storage migration.
Explanation:
Hyper-V in Windows Server 2012 R2 introduces support for moving virtual machine storage without downtime
by making it possible to move the storage while the virtual machine remains running.
Virtual Machine Storage Migration Overview
http://technet.microsoft.com/en-us/library/hh831656.aspx