Consider the following scenario:
You use 4 SSD disks to create a 12-disk storage pool on a Windows Server 2012 R2-based cluster.
You turn off one of the disks.
In this scenario, the data path crashes because of a read error from the SSD space, and the disk loses a Persistent Reservation (PR). Therefore, the storage pool stops working.
Note PRs are used by Windows failover clustering to arbitrate access to shared disks and to avoid data corruption.
To resolve this issue, install update rollup 2955164. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2955164 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: May 2014
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