MPIO LUN loss on storage controller failover in Windows Server 2012 R2
Content provided by Microsoft
Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 EssentialsWindows Server 2012 R2 FoundationMore
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.