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File server becomes unresponsive when data deduplication is running in Windows Server 2012 R2

Assume that you are using Windows Server 2012 R2 as a Server Message Block (SMB) file server, and you have data deduplication enabled. After it operates for some time (typically several days), the SMB Service becomes unresponsive, and clients lose connections to the server.

When this issue occurs, the SMB server requires a manual restart for recovery.
More information

Known issues in update rollup 3161606

Running data deduplication on a Cluster Shared Volume (CSV) on Windows Server 2012 R2 based-Hyper V cluster may impact live migration where resource hosting subsystem (RHS) may deadlock and crash with 0x9E Stop error.

This issue occurs because of an incorrect status returned by data deduplication driver to the CSV file system causing a 0x9E Stop error.


To fix this issue, download and install July 2016 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (KB3172614).
Learn about the terminology that Microsoft uses to describe software updates.

Article ID: 3135021 - Last Review: 07/22/2016 08:27:00 - Revision: 7.0

Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows Server 2012 R2 Standard

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