Support Tip: Hyper-V hosts fail and log Event ID 5120 when being backed up

Michael Vargo | Senior Support Escalation Engineer

imageUPDATED 1/6/2014 – New hotfixes available

Some customers are experiencing failures on Windows Server 2012 Hyper-V hosts that utilize Cluster Shared Volumes (CSVs) when backing up virtual machines (VM’s) using System Center 2012 Data Protection Manager (DPM 2012) with Service Pack 1 (SP1) or later.

When this occurs the following error is logged on the Hyper-V hosts.

Log Name: System
Source: Microsoft-Windows-FailoverClustering
Event ID: 5120
Logged: <date/time>
Details: Cluster Shared Volume 'Volume2' ('ClusterStorage Volume 2') is no longer available on this node because of 'STATUS_CLUSTER_CSV_AUTO_PAUSE_ERROR(c0130021)'. All I/O will temporarily be queued until a path to the volume is reestablished.

You may also see the VM’s pause temporarily, go in to a paused state, shut down, see memory spikes or CSV go into a failed state on the Hyper-V hosts. Configuring serialized backups doesn't help the problem.

It has been determined that any backup product using shadow copies results in the same errors, thus this isn't necessarily a DPM 2012 issue. 

The Windows and DPM teams have released a series of fixes to address some general Cluster, CSV backup and DPM issues and are now available for download. 


KB2886362 – Hotfix for System Center 2012 SP1 Data Protection Manager (

NOTE The above fix requires a prerequisite fix:  2836751 – Description of Update Rollup 3 for System Center 2012 Service Pack 1 (


KB2878635 – Update is available that improves the resiliency of the cloud service provider in Windows Server 2012: December 2013 (

Also see KB2784261 – Recommended hotfixes and updates for Windows Server 2012-based Failover Clusters (

Michael Vargo | Senior Support Escalation Engineer | Microsoft GBS Management and Security Division

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