MPIO LUN loss on storage controller failover in Windows Server 2012 R2

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials


Assume that you have a Windows Server 2012 R2-based computer connected to a storage device through multiple paths by using Multipath I/O (MPIO). When multiple paths fail over concurrently or in quick succession, the I/O operation may fail, and the computer may lose its connection to the storage device.

Note This issue can occur with any disk that's connected over multiple paths by using MPIO.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Learn about the terminology that Microsoft uses to describe software updates.