Consider the following scenario:
You have a failover cluster that is running in Windows Server 2012 R2 or Windows Server 2012.
You add a GPT-format physical disk together with multiple partitions on the cluster.
You install a Volume Shadow Copy Service (VSS) hardware provider, and then you take a VSS snapshot of the disk.
You enable maintenance mode, and then you put the volume into maintenance mode.
In this scenario, the volume fails with an "access denied" error message, and you cannot lock the volume.
To resolve this issue, install update rollup 2962409, or install update rollup 2962407.
For more information about how to obtain these update rollup packages, click one of the following article numbers to view the article in the Microsoft Knowledge Base:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates