Important update that improves cluster resiliency in Windows Server 2012 is available

Microsoft released a very important bug fix which could solve issues for many customers. In short all sort of issues can happen when using Windows Server 2012 in combination with clustering, SMB shares or CSV volumes. Some issues are initiated by backup processes or snapshotting.

These issues are first reported in November 2012. Microsoft released several fixes but these sometimes solved the initial issue but created a new issues. I wrote about these in my post titled Storage issues on Windows Server 2012 Hyper-V. Microsoft struggling to fix!

Mid of May 2013 Microsoft published a new knowledgebase article and a hotfix. The KB2838669  is titled Update that improves cluster resiliency in Windows Server 2012 is available The hotfix did not get attention by the blogosphere yet although it is an important update.

Lets hope this solves the issues reported! I could not find feedback on this hotfix.

This article introduces an update for cluster resiliency improvements in Windows Server 2012. After you install this update, the following issues that you experience are resolved:
Issue 1 Consider the following scnario:

  • You have the Hyper-V server role installed on a Windows Server 2012-based file server.
  • You have lots of virtual machines on a Server Message Block (SMB) share.
  • Virtual hard disks are attached to an iSCSI controller.

In this scenario, you cannot access to the iSCSI controller.
Issue 2 Consider the following scenario:

  • You have a two-node failover cluster that is running Windows Server 2012.
  • The cluster is partitioned.
  • There is a Cluster Shared Volume (CSV) on a cluster node, and a quorum resource on the other cluster node.

In this scenario, the cluster becomes unavailable.
Note This issue can be temporarily resolved by restarting the cluster.
Issue 3 Assume that you set up an SMB connection between two Windows Server 2012-based computers. The hardware on the computers do not support Offloaded Data Transfer (ODX). In this situation, the SMB session is closed unexpectedly.
Issue 4 Consider the following scenario:

  • You have a Windows Server 2012-based failover cluster.
  • You have a virtual machine on a CSV volume on the cluster.
  • You try to create a snapshot for the virtual machine. However, the snapshot creation is detected as stuck. Therefore, the snapshot set is aborted.
  • During the abortion process of the snapshot, the CSV volume is deleted after the snapshot shares are deleted.

In this scenario, the abortion process is paused automatically because of an error that occurs on the cluster.
Issue 5 Assume that you have a Windows Server 2012-based failover cluster. Two specific snapshot state change requests are sent from disk control manager to CSV proxy file system (CSVFS). The requests are present in the same message. In this situation, disk control manager is out-of-sync with CSVFS.
Issue 6 Assume that you create a snapshot for a CSV volume on a Windows Server 2012-based failover cluster. When the snapshot creation is still in progress, another snapshot creation is requested on the same CSV volume. In this situation, the snapshot creation fails and all later snapshot creation attempts on the CSV volume fail.
Note You cannot create a snapshot for the CSV volume until the volume fails over or the volume goes offline and then back online.
Additionally, the update also resolves the issues that are described in the following Microsoft Knowledge Base (KB) articles:

2799728

      (http://support.microsoft.com/kb/2799728/            )

Virtual machine enters a paused state or a CSV volume goes offline when you try to create a backup of the virtual machine on a Windows Server 2012-based failover cluster

2801054

      (http://support.microsoft.com/kb/2801054/            )

VSS_E_SNAPSHOT_SET_IN_PROGRESS error when you try to back up a virtual machine in Windows Server 2012

2796995

      (http://support.microsoft.com/kb/2796995/            )

Offloaded Data Transfers fail on a computer that is running Windows 8 or Windows Server 2012

2813630

      (http://support.microsoft.com/kb/2813630/            )

Virtual machine enters a paused state or a CSV volume goes offline when you try to create a backup of the virtual machine on a Windows Server 2012-based failover cluster

2824600

      (http://support.microsoft.com/kb/2824600/            )

Virtual machine enters a paused state or goes offline when you try to create a backup of the virtual machine on a CSV volume in Windows Server 2012

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